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360
Useful information ............................ 362
Important safety notes .................... 362
Operation ........................................... 362
Winter operation ............................... 364
Tire pressure ..................................... 366
Loading the vehicle .......................... 373
All about wheels and tires ............... 377
Changing a wheel ............................. 384
Wheel and tire combinations ........... 389
Emergency spare wheel ................... 398361
362 Operation
Useful information
i This Operator's Manual describes all models and all standard and optional equipment of your vehicle available at the time of publication of the Operator's Manual. Country-specific differences are possible. Please note that your vehicle may not be equipped with all features described. This also applies to safety- related systems and functions.
i Read the information on qualified specialist workshops: (Y page 25).
Important safety notes
G WARNING If wheels and tires of the wrong size are used, the wheel brakes or suspension components may be damaged. There is a risk of accident. Always replace wheels and tires with those that fulfill the specifications of the original part (designation, manufacturer, model). G WARNING A flat tire severely impairs the driving, steering and braking characteristics of the vehicle. There is a risk of accident. Tires without run-flat characteristics: Rdo not drive with a flat tire. Rimmediately replace the flat tire with your emergency spare wheel or spare wheel, or consult a qualified specialist workshop.
Tires with run-flat characteristics: Rpay attention to the information and
warning notices on MOExtended tires (tires with run-flat characteristics).
Accessories that are not approved for your vehicle by Mercedes-Benz or are not being used correctly can impair the operating safety.
Before purchasing and using non-approved accessories, visit a qualified specialist workshop and inquire about: Rsuitability Rlegal stipulations Rfactory recommendations Information on the dimensions and types of wheels and tires for your vehicle can be found under "Wheel/tire combinations" (Y page 389). Information on air pressure for the tires on your vehicle can be found: Ron the vehicle's Tire and Loading Information placard on the B-pillar (Y page 373)
Ron the tire pressure label on the fuel filler
flap (Y page 170)
Runder "Tire pressure" (Y page 366) Rin the "Tire pressure" section
Operation Information on driving If the vehicle is heavily laden, check the tire pressures and correct them if necessary. While driving, pay attention to vibrations, noises and unusual handling characteristics, e.g. pulling to one side. This may indicate that the wheels or tires are damaged. If you suspect that a tire is defective, reduce your speed immediately. Stop the vehicle as soon as possible to check the wheels and tires for damage. Hidden tire damage could also be causing the unusual handling characteristics. If you find no signs of damage, have the tires and wheels checked at a qualified specialist workshop. When parking your vehicle, make sure that the tires do not get deformed by the curb or other obstacles. If it is necessary to drive over curbs, speed humps or similar elevations, try to do so slowly and at an obtuse angle. Otherwise, the tires, particularly the sidewalls, may be damaged.
Regular checking of wheels and tires G WARNING Damaged tires can cause tire inflation pressure loss. As a result, you could lose control of your vehicle. There is a risk of accident. Check the tires regularly for signs of damage and replace any damaged tires immediately.
Regularly check the wheels and tires of your vehicle for damage at least once a month, as well as after driving off-road or on rough roads. Damaged wheels can cause a loss of tire pressure. Pay particular attention to damage such as: Rcuts in the tires Rpunctures Rtears in the tires Rbulges on tires Rdeformation or severe corrosion on wheels Regularly check the tire tread depth and the condition of the tread across the whole width of the tire (Y page 363). If necessary, turn the front wheels to full lock in order to inspect the inner side of the tire surface. All wheels must have a valve cap to protect the valve against dirt and moisture. Do not mount anything onto the valve other than the standard valve cap or other valve caps approved by Mercedes-Benz for your vehicle. Do not use any other valve caps or systems, e.g. tire pressure monitoring systems. Regularly check the pressure of all the tires particularly prior to long trips. Adjust the tire pressure as necessary (Y page 366). Observe the notes on the emergency spare wheel (Y page 398). The service life of tires depends on the following factors amongst other things: RDriving style RTire pressure RDistance covered
Operation 363
Tire tread G WARNING Insufficient tire tread will reduce tire traction. The tire is no longer able to dissipate water. This means that on wet road surfaces, the risk of hydroplaning increases, in particular where speed is not adapted to suit the driving conditions. There is a risk of accident. If the tire pressure is too high or too low, tires may exhibit different levels of wear at different locations on the tire tread. Thus, you should regularly check the tread depth and the condition of the tread across the entire width of all tires. Minimum tire tread depth for: RSummer tires: â in (3 mm) RM+S tires: ã in (4 mm) For safety reasons, replace the tires before the legally prescribed limit for the minimum tire tread depth is reached.
Bar indicator : for tread wear is integrated into the tire tread. Tread wear indicators (TWI) are required by law. Six indicators are positioned on the tire tread. They are visible once the tread depth is approximately á in (1.6 mm). If this is the case, the tire is so worn that it must be replaced.
364 Winter operation
Selecting, mounting and replacing tires ROnly mount tires and wheels of the same
type and make.
ROnly mount tires of the correct size onto
the wheels.
RBreak in new tires at moderate speeds for the first 60 miles (100 km). They only reach their full performance after this distance. RDo not drive with tires which have too little
tread depth, as this significantly reduces the traction on wet roads (hydroplaning).
RReplace the tires after six years at the
latest, regardless of wear.
Observe the notes on the emergency spare wheel (Y page 398).
MOExtended tires (tires with run-flat properties) With MOExtended tires (tires with run flat characteristics), you can continue to drive your vehicle even if there is a total loss of pressure in one or more tires. MOExtended tires may only be used in conjunction with an active tire pressure loss warning system or with an active tire pressure monitor and on wheels specifically tested by Mercedes-Benz. Notes on driving with MOExtended tires with a flat tire (Y page 344). i Vehicles equipped with MOExtended tires are not equipped with a TIREFIT kit at the factory. It is therefore recommended that you additionally equip your vehicle with a TIREFIT kit if you mount tires that do not feature run-flat properties, e.g. winter tires. A TIREFIT kit can be obtained from a qualified specialist workshop.
Winter operation General notes Have your vehicle winterproofed at a qualified specialist workshop at the onset of winter. Observe the notes in the "Changing a wheel" section (Y page 384).
Driving with summer tires At temperatures below 45 ‡ (+7 †), summer tires lose elasticity significantly, and therefore traction and braking power as well. Change the tires on your vehicle to M+S tires. Using summer tires at very cold temperatures could cause cracks to form, thereby damaging the tires permanently. Mercedes-Benz cannot accept responsibility for this type of damage.
M+S tires G WARNING M+S tires with a tire tread depth of less than ã in (4 mm) are not suitable for use in winter and do not provide sufficient traction. There is a risk of an accident. M+S tires with a tread depth of less than ã in (4 mm) must be replaced immediately.
At temperatures below 45 ‡ (+7 †), use winter tires or all-weather tires. Both types of tire are identified by the M+S marking. Only winter tires bearing the i snowflake symbol in addition to the M+S marking provide the best possible grip in wintry road conditions. Only these tires will allow driving safety systems such as ABS and ESP® to function optimally in winter. These tires have been developed specifically for driving in snow. Use M+S tires of the same make and tread on all wheels to maintain safe handling characteristics.
Always observe the maximum permissible speed specified for the M+S tires you have mounted. Once the winter tires are mounted: X Check the tire pressures (Y page 369). X Vehicles for Canada: restart the tire
pressure loss warning system (Y page 370).
X Restart the tire pressure monitor
(Y page 370).
For more information on driving with the emergency spare wheel, see (Y page 398).
Snow chains G WARNING If snow chains are installed to the front wheels, they may drag against the vehicle body or chassis components. This could cause damage to the vehicle or the tires. There is a risk of an accident. To avoid hazardous situations: Rnever install snow chains to the front
wheels
Ralways install snow chains in pairs to the
rear wheels.
! On vehicles with AIRMATIC, you must
drive at raised vehicle level if snow chains have been mounted. The vehicle may otherwise be damaged.
! On some tire sizes there is not enough
space for snow chains. To avoid damage to the vehicle or tires, observe the "Wheel and tire combinations" section under "Tires and wheels".
! Vehicles with steel wheels: if you wish
to mount snow chains on steel wheels, make sure that you remove the respective wheels' hubcaps first. The hubcaps may otherwise be damaged.
For safety reasons, Mercedes-Benz recommends that you only use snow chains that have been specially approved for your
Winter operation 365
vehicle by Mercedes-Benz, or are of a corresponding standard of quality. If you intend to mount snow chains, please bear the following points in mind: RSnow chains may not be mounted on all
wheel/tire combinations. Permissible wheel-tire combinations (Y page 389). ROnly use snow chains when driving on
roads completely covered by snow. Remove the snow chains as soon as possible when you come to a road that is not snow-covered.
RLocal regulations may restrict the use of
snow chains. Observe the appropriate regulations if you wish to mount snow chains.
RDo not exceed the maximum permissible
speed of 30 mph (50 km/h).
i You may wish to deactivate ESP® when pulling away with snow chains installed (Y page 70). This way you can allow the wheels to spin in a controlled manner, achieving an increased driving force (cutting action).
For more information on driving with the emergency spare wheel, see (Y page 398).
366 Tire pressure
Tire pressure Tire pressure specifications Important safety notes G WARNING Tires with tire pressures that are too low or too high are associated with the following hazards: Rthey can burst, in particular if the vehicle is
heavily laden or when driven at high speeds.
Rthe tires can wear excessively and/or
unevenly, which can severely impair tire traction.
Rthe driving, steering and braking
characteristics may be severely impaired.
There is a risk of accident. Follow recommended tire inflation pressures and check the pressure of all the tires including the spare wheel: Rmonthly, at least Rif the load changes Rbefore beginning a long journey Runder different operating conditions, e.g.
off-road driving
If necessary, correct the tire pressure.
i The specifications on the sample Tire and
Loading Information placard and tire pressure tables are examples. Tire pressure specifications are vehicle-specific and may deviate from the data shown here. The tire pressure specifications that are valid for your vehicle can be found on the Tire and Loading Information placard and tire pressure table on the vehicle.
General notes The recommended tire pressures for the tires mounted at the factory can be found on the labels described here. Operation with the emergency spare wheel (Y page 398).
Further information on tire pressures can be obtained at a qualified specialist workshop.
Tire and Loading Information placard
: Recommended tire pressures The Tire and Loading Information placard is on the B-pillar on the driver's side (Y page 373). The Tire and Loading Information placard contains the recommended tire pressures for cold tires. The recommended tire pressures are valid for the maximum permissible load and up to the maximum permissible vehicle speed.
Tire pressure table The tire pressure table is on the inside of the fuel filler flap.
Example: tire pressure table for all tires permitted for this vehicle by the factory The tire pressure table contains the recommended pressures for cold tires for various operating conditions, i.e. differing load and speed conditions.
Tire pressure 367
If the tire pressure is not set correctly, this can lead to an excessive build up of heat and a sudden loss of pressure. For more information, contact a qualified specialist workshop.
Important notes on tire pressure G WARNING If the tire pressure drops repeatedly, the wheel, valve or tire may be damaged. Tire pressure that is too low may result in a tire blow-out. There is a risk of an accident. RCheck the tire for foreign objects. RCheck whether the wheel is losing air or the
valve is leaking.
If you are unable to rectify the damage, contact a qualified specialist workshop. G WARNING If you fit unsuitable accessories onto tire valves, the tire valves may be overloaded and malfunction, which can cause tire pressure loss. Due to their design, retrofitted tire pressure monitors keep the tire valve open. This can also result in tire pressure loss. There is a risk of an accident. Only screw the standard valve cap or other valve caps approved by Mercedes-Benz for your vehicle onto the tire valve.
Use a suitable pressure gauge to check the tire pressure. The outer appearance of a tire does not permit any reliable conclusion about the tire pressure. On vehicles equipped with the electronic tire pressure monitoring system, the tire pressure can be checked using the on-board computer. The tire temperature and pressure increase when the vehicle is in motion. This is dependent on the driving speed and the load. Therefore, you should only correct tire pressures when the tires are cold.
Example: tire pressure table with tire dimensions If a tire size precedes a tire pressure, the tire pressure information following is only valid for that tire size. The load conditions "partially laden" and "fully laden" are defined in the table for different numbers of occupants and amounts of luggage. The actual number of seats may differ.
Some tire pressure tables show only the rim diameters instead of the full tire size, e.g. R18. The rim diameter is part of the tire size and can be found on the tire sidewall (Y page 378). If the tire pressures have been set to the lower values for lighter loads and/or lower road speeds, the pressures should be reset to the higher values: Rif you want to drive with an increased load
and/or
Rif you want to drive at higher road speeds. i The tire pressures for increased loads
and/or higher road speeds, shown in the tire pressure table, may have a negative effect on driving comfort.
368 Tire pressure
The tires are cold: Rif the vehicle has been parked without
direct sunlight on the tires for at least three hours and
Rif the vehicle has been driven for less than
1 mile (1.6 km).
The tire temperature changes depending on the outside temperature, the vehicle speed and the tire load. If the tire temperature changes by 18 ‡ (10 †), the tire pressure changes by approximately 10 kPa (0.1 bar/ 1.5 psi). Take this into account when checking the pressure of warm tires. Only correct the tire pressure if it is too low for the current operating conditions. If you check the tire pressure when the tires are warm, the resulting value will be higher than if the tires were cold. This is normal. Do not reduce the tire pressure to the value specified for cold tires. The tire pressure would otherwise be too low. Observe the recommended tire pressures for cold tires: Ron the Tire and Loading Information placard
on the B-pillar on the driver's side
Rin the tire pressure table on the inside of
the fuel filler flap
Ron the yellow label on the emergency spare
wheel (depending on the vehicle equipment)
Underinflated or overinflated tires Underinflation G WARNING Tires with pressure that is too low can overheat and burst as a consequence. In addition, they also suffer from excessive and/ or irregular wear, which can severely impair the braking properties and the driving characteristics. There is a risk of an accident. Avoid tire pressures that are too low in all the tires, including the spare wheel.
Underinflated tires may: Roverheat, leading to tire defects Rhave an adverse effect on handling
characteristics
Rwear quickly and unevenly Rhave an adverse effect on fuel consumption
Overinflation G WARNING Tires with excessively high pressure can burst because they are damaged more easily by road debris, potholes etc. In addition, they also suffer from irregular wear, which can severely impair the braking properties and the driving characteristics. There is a risk of an accident. Avoid tire pressures that are too high in all the tires, including the spare wheel.
Overinflated tires may: Rincrease the braking distance Rhave an adverse effect on handling
characteristics
Rwear quickly and unevenly Rhave an adverse effect on ride comfort Rbe more susceptible to damage
Maximum tire pressures
: Example: maximum permissible tire
pressure
Never exceed the maximum permissible tire inflation pressure. Always observe the recommended tire pressure for your vehicle
when adjusting the tire pressure (Y page 366). i The actual values for tires are vehicle-
specific and may deviate from the values in the illustration.
Checking the tire pressures Important safety notes Observe the notes on tire pressure (Y page 366). Information on air pressure for the tires on your vehicle can be found: Ron the vehicle's Tire and Loading Information placard on the B-pillar (Y page 373)
Ron the tire pressure label on the fuel filler
flap (Y page 170)
Rin the "Tire pressure" section Runder "Tire pressure" (Y page 366)
Checking tire pressures manually To determine and set the correct tire pressure, proceed as follows: X Remove the valve cap of the tire that is to
be checked.
X Press the tire pressure gauge securely onto
the valve.
X Read the tire pressure and compare it with
the recommended value on the Tire and Loading Information placard (Y page 366). X If the tire pressure is too low, increase it to
the recommended value.
X If the tire pressure is too high, release air by pressing down the metal pin in the valve. Use the tip of a pen, for example. Then, check the tire pressure again using the tire pressure gauge.
X Screw the valve cap onto the valve. X Repeat these steps for the other tires.
Tire pressure 369
Tire pressure loss warning system (Canada only) Important safety notes While the vehicle is in motion, the tire pressure loss warning system monitors the set tire pressure using the rotational speed of the wheels. This enables the system to detect significant pressure loss in a tire. If the speed of rotation of a wheel changes as a result of a loss of pressure, a corresponding warning message will appear in the multifunction display. The tire pressure warning system does not warn you of an incorrectly set tire pressure. Observe the notes on the recommended tire pressure (Y page 366). The tire pressure loss warning system does not replace the need to regularly check your vehicle's tire pressures, since an even loss of pressure on several tires at the same time cannot be detected by the tire pressure loss warning system. The tire pressure monitor is not able to warn you of a sudden loss of pressure, e.g. if the tire is penetrated by a foreign object. In the event of a sudden loss of pressure, bring the vehicle to a halt by braking carefully. Avoid abrupt steering maneuvers. The function of the tire pressure loss warning system is limited or delayed if: Rsnow chains are mounted to your vehicle's
tires.
Rroad conditions are wintry. Ryou are driving on sand or gravel. Ryou adopt a very sporty driving style
(cornering at high speeds or driving with high rates of acceleration).
Ryou are driving with a heavy load (in the
vehicle or on the roof).
370 Tire pressure
Restarting the tire pressure loss warning system Restart the tire pressure loss warning system if you have: Rchanged the tire pressure Rchanged the wheels or tires Rmounted new wheels or tires X Before restarting, make sure that the tire pressures are set properly on all four tires for the respective operating conditions. The recommended tire pressures can be found on the Tire and Loading Information placard on the B-pillar on the driver's side or the tire pressure table on the fuel filler flap. The tire pressure loss warning system can only give reliable warnings if you have set the correct tire pressure. If an incorrect tire pressure is set, these incorrect values will be monitored.
X Also observe the notes in the section on tire
pressures (Y page 366).
X Make sure that the SmartKey is in
position 2 (Y page 153) in the ignition lock. X Press = or ; on the steering wheel to select the Serv.Serv. menu. X Press the 9 or : button to select Tire Pressure. X Press the a button.
The message appears in the multifunction display.
If you wish to confirm the restart: X Press the a button. The Tire Pressure Now OK? message appears in the multifunction display. X Press the 9 or : button to select Yes. X Press the a button. The Run Flat Indicator Restarted message appears in the multifunction display. After a teach-in period, the tire pressure loss warning system will monitor the set tire pressures of all four tires.
If you wish to cancel the restart: X Press the % button. or X When the Tire Pressure Now OK? message appears, press the 9
or : button to select Cancel. X Press the a button.The tire pressure values stored at the last restart will continue to be monitored.
Tire pressure monitor Important safety notes G WARNING Each tire, including the spare (if provided), should be checked at least once a month when cold and inflated to the pressure recommended by the vehicle manufacturer on the Tire and Loading Information placard on the driver's door B-pillar or the tire pressure label on the inside of the fuel filler flap. If your vehicle has tires of a different size than the size indicated on the Tire and Loading Information placard or the tire pressure label, you should determine the proper tire pressure for those tires. As an added safety feature, your vehicle has been equipped with a tire pressure monitoring system (TPMS) that illuminates a low tire pressure telltale when one or more of your tires are significantly underinflated. Accordingly, when the low tire pressure telltale illuminates, you should stop and check your tires as soon as possible, and inflate them to the proper pressure. Driving on a significantly underinflated tire causes the tire to overheat and can lead to tire failure. Underinflation also reduces fuel efficiency and tire tread life, and may affect the vehicle's handling and stopping ability. Please note that the TPMS is not a substitute for proper tire maintenance, and it is the driver's responsibility to maintain correct tire pressure, even if underinflation has not
reached the level to trigger illumination of the TPMS low tire pressure telltale. USA only: Your vehicle has also been equipped with a TPMS malfunction indicator to indicate if the system is not operating properly. The TPMS malfunction indicator is combined with the low tire pressure telltale. When the system detects a malfunction, the warning lamp will flash for approximately a minute and then remain continuously illuminated. This sequence will be repeated every time the vehicle is started as long as the malfunction exists. When the malfunction indicator is illuminated, the system may not be able to detect or signal low tire pressure as intended. TPMS malfunctions may occur for a variety of reasons, including the installation of incompatible replacement or alternate tires or wheels on the vehicle that prevent the TPMS from functioning properly. Always check the TPMS malfunction telltale after replacing one or more tires or wheels on your vehicle to ensure that the replacement or alternate tires and wheels allow the TPMS to continue to function properly.
It is the driver's responsibility to set the tire pressure to that recommended for cold tires which is suitable for the operating situation (Y page 366). Note that the correct tire pressure for the current operating situation must first be taught-in to the tire pressure monitor. If there is a substantial loss of pressure, the warning threshold for the warning message is aligned to the reference values taught-in. Restart the tire pressure monitor after adjusting the pressure of the cold tires (Y page 373). The current pressures are saved as new reference values. As a result, a warning message will appear if the tire pressure drops significantly. The tire pressure monitor does not warn you of an incorrectly set tire pressure. Observe the notes on the recommended tire pressure (Y page 366).
Tire pressure 371
The tire pressure monitor is not able to warn you of a sudden loss of pressure, e.g. if the tire is penetrated by a foreign object. In the event of a sudden loss of pressure, bring the vehicle to a halt by braking carefully. Avoid abrupt steering maneuvers. If a tire pressure monitor system is installed, the vehicle's wheels have sensors installed that monitor the tire pressures in all four tires. The tire pressure monitor warns you if the pressure drops in one or more of the tires. The tire pressure monitor only functions if the correct sensors are installed on all wheels. The tire pressure monitor has a yellow warning lamp in the instrument cluster for indicating pressure loss/malfunctions (USA) or pressure loss (Canada). Whether the warning lamp flashes or lights up indicates whether a tire pressure is too low or the tire pressure monitor is malfunctioning: Rif the warning lamp is lit continuously, the
tire pressure on one or more tires is significantly too low. The tire pressure monitor is not malfunctioning.
RUSA only: if the warning lamp flashes for
around a minute and then remains lit constantly, the tire pressure monitor is malfunctioning.
Information on tire pressures is displayed in the multifunction display. After a few minutes of driving, the current tire pressure of each tire is shown in the multifunction display. USA only: if there is a malfunction with the tire pressure monitor it can take more than ten minutes until the malfunction is shown by the tire pressure warning lamp flashing for approximately one minute and then lighting up continuously. When the malfunction has been rectified, the tire pressure warning lamp goes out after a few minutes of driving. The tire pressure values indicated by the on- board computer may differ from those measured at a gas station with a pressure gauge. The tire pressures shown by the on- board computer refer to those measured at sea level. At high altitudes, the tire pressure
372 Tire pressure
values indicated by a pressure gauge are higher than those shown by the on-board computer. In this case, do not reduce the tire pressures. The operation of the tire pressure monitor can be affected by interference from radio transmitting equipment (e.g. radio headphones, two-way radios) that may be being operated in or near the vehicle. i USA only:
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause interference, and 2. this device must accept any interference received, including interference that may cause undesired operation of the device. Any unauthorized modification to this device could void the user's authority to operate the equipment.
i Canada only:
This device complies with RSS-210 of Industry Canada. Operation is subject to the following two conditions: 1. This device may not cause interference, and 2. this device must accept any interference received, including interference that may cause undesired operation. Any unauthorized modification to this device could void the user's authority to operate the equipment.
Checking tire pressure electronically X Make sure that the SmartKey is in
position 2 (Y page 153) in the ignition lock. X Press the = or ; button on the steering wheel to select the Serv. menu.
X Press the 9 or : button to select Tire Pressure. X Press button a.
The current tire pressure for each wheel will be displayed in the multifunction display. If the vehicle was parked for longer than 20 minutes the Tire pressures will be displayed after driving a few minutes message is shown. After a teach-in period, the tire pressure monitor automatically recognizes new wheels or new sensors. If a clear allocation of the tire pressure values to the individual wheels is not possible, the message is shown instead of the tire pressure display. The tire pressures are already being monitored. i If an emergency spare wheel is mounted, the system may continue to show the tire pressure of the wheel that has been removed for a few minutes. If this occurs, note that the value displayed for the position where the spare wheel is mounted is not the same as the current tire pressure of the emergency spare wheel.
Tire pressure monitor warning messages If the tire pressure monitor detects a significant pressure loss on one or more tires, a warning message is shown in the multifunction display. A warning tone also sounds and the tire pressure warning lamp lights up in the instrument cluster. Each tire that is affected by a significant loss of pressure is highlighted in the pressure display. X If the Correct Tire Pressure message appears in the multifunction display, check the tire pressure on all four wheels and correct it if necessary.
i If the wheel positions on the vehicle are interchanged, the tire pressures may be displayed for the wrong positions for a short time. This is rectified after a few
minutes of driving, and the tire pressures are displayed for the correct positions.
Restarting the tire pressure monitor When you restart the tire pressure monitor, all existing warning messages are deleted and the warning lamps go out. The monitor uses the currently set tire pressures as the reference values for monitoring. In most cases, the tire pressure monitor will automatically detect the new reference values after you have changed the tire pressure. However, you can also define reference values manually as described here. The tire pressure monitor then monitors the new tire pressure values. X Set the tire pressure to the value
recommended for the corresponding driving situation on the Tire and Loading Information placard on the driver's side B-pillar (Y page 366). Additional tire pressure values for different loads can also be found on the tire pressure table on the inside of the fuel filler flap (Y page 366).
X Make sure that the tire pressure is correct
on all four wheels.
X Make sure that the SmartKey is in position
2 in the ignition lock. X Press the = or ; button on the steering wheel to select the Serv. menu. X Press the 9 or : button to select Tire Pressure. X Press the a button.
The multifunction display shows the current tire pressure for each tire or the Tire pressures displayed after driving a few minutes message. X Press the : button. The multifunction display shows the Use Current Pressure Values as New Reference Values message.
Loading the vehicle 373
If you wish to confirm the restart: X Press the a button. The Tire Pressure Monitor Restarted message appears in the multifunction display. After driving for a few minutes, the system checks whether the current tire pressures are within the specified range. The new tire pressures are then accepted as reference values and monitored.
If you wish to cancel the restart: X Press the % button.
The tire pressure values stored at the last restart will continue to be monitored.
Loading the vehicle Instruction labels for tires and loads G WARNING Overloaded tires can overheat, causing a blowout. Overloaded tires can also impair the steering and driving characteristics and lead to brake failure. There is a risk of accident. Observe the load rating of the tires. The load rating must be at least half of the GAWR of your vehicle. Never overload the tires by exceeding the maximum load.
Two instruction labels on your vehicle show the maximum possible load. (1) The Tire and Loading Information placard is on the B-pillar on the driver's side. The Tire and Loading Information placard shows the maximum permissible number of occupants and the maximum permissible vehicle load. It also contains details of the tire sizes and corresponding pressures for tires installed at the factory.
(2) The vehicle identification plate is on the B-pillar on the driver's side. The vehicle identification plate informs you of the gross vehicle weight rating. It is made up of the vehicle weight, all vehicle
374 Loading the vehicle
occupants, the fuel and the cargo. You can also find information about the maximum gross axle weight rating on the front and rear axle. The maximum gross axle weight rating is the maximum weight that can be carried by one axle (front or rear axle). Never exceed the maximum load or the maximum gross axle weight rating for the front or rear axle.
i The specifications shown on the Tire and
Loading Information placard in the illustration are examples. The maximum permissible gross vehicle weight rating is vehicle-specific and may differ from that in the illustration. You can find the valid maximum permissible gross vehicle weight rating for your vehicle on the Tire and Loading Information placard.
Number of seats
B-pillar (example: Sedan)
Maximum permissible gross vehicle weight rating
Maximum number of seats : indicates the maximum number of occupants allowed to travel in the vehicle. This information can be found on the Tire and Loading Information placard. i The specifications shown on the Tire and
Loading Information placard in the illustration are examples. The number of seats is vehicle-specific and can differ from the details shown. The number of seats in your vehicle can be found on the Tire and Loading Information placard.
X Specification for maximum gross vehicle weight : is listed in the Tire and Loading Information placard: "The combined weight of occupants and cargo should never exceed XXX kilograms or XXX lbs."
The gross weight of all vehicle occupants, load and luggage must not exceed the specified value.
Determining the correct load limit Step-by-step instructions The following steps have been developed as required of all manufacturers under Title 49, Code of U.S. Federal Regulations, Part 575
pursuant to the "National Traffic and Motor Vehicle Safety Act of 1966".X Step 1: Locate the statement "The
combined weight of occupants and cargo should never exceed XXX kg or XXX lbs." on your vehicle’s Tire and Loading Information placard.
X Step 2: Determine the combined weight of the driver and passengers that will be riding in your vehicle.
X Step 3: Subtract the combined weight of
the driver and passengers from XXX kilograms or XXX lbs.
X Step 4: The resulting figure equals the
available amount of cargo and luggage load capacity. For example: at a sum “XXX” of 1400 lbs and five occupants each weighing 150 lbs, the amount of available cargo and luggage load capacity is 650 lbs (1400 - 750 (5 x 150) = 650 lbs).
X Step 5: Determine the combined weight of
luggage and cargo being loaded on the vehicle. That weight may not safely exceed the available cargo and luggage load capacity calculated in step 4.
Example: steps 1 to 3
The following table shows examples on how to calculate total and cargo load capacities with varying seating configurations and number and size of occupants. The following examples use a load limit of 1500 lbs (680 kg). This is for illustration purposes only. Make sure you are using the actual load limit for your vehicle stated on your vehicle's Tire and Loading Information placard (Y page 373). The higher the weight of all the occupants, the smaller the maximum load for luggage.Step 1
Combin ed maximu weight of occupa nts and cargo (data from the Tire and Loading Informa tion placard)
Step 2
Number of people in the vehicle (driver and occupa nts) Distribu tion of the occupa nts
Loading the vehicle 375
Exampl e 1
1500 lbs (680 kg)Exampl e 2
1500 lbs (680 kg)Exampl e 3
1500 lbs (680 kg)Exampl e 1
Exampl e 2
Exampl e 3
Front: 2
Rear: 3Front: 1
Rear: 2Front: 1
376 Loading the vehicle
Weight of the occupa nts
Gross weight of all occupa nts
Exampl e 1
1500 lbs (680 kg) Ò750 lbs (340 kg) 750 lbs (340 kg)Exampl e 2
1500 lbs (680 kg) Ò540 lbs (245 kg) 960 lbs (435 kg)Exampl e 3
1500 lbs (680 kg) Ò150 lbs (68 kg) = 1350 lbs (612 kg)Exampl e 1
Occupan t 1: 150 lbs (68 kg) Occupan t 2: 180 lbs (82 kg) Occupan t 3: 160 lbs (73 kg) Occupan t 4: 140 lbs (63 kg) Occupan t 5: 120 lbs (54 kg) 750 lbs (340 kg)Exampl e 3
Occupan t 1: 150 lbs (68 kg)Exampl e 2
Occupan t 1: 200 lbs (91 kg) Occupan t 2: 190 lbs (86 kg) Occupan t 3: 150 lbs (68 kg)540 lbs (245 kg)
150 lbs (68 kg)
Step 3
Permiss ible load (maxim um gross vehicle weight rating from the Tire and Loading Informa tion placard minus the gross weight of all occupa nts)
Vehicle identification plate Even if you have calculated the total load carefully, you should still make sure that the gross vehicle weight rating and the gross axle weight rating are not exceeded. Details can be found on the vehicle identification plate on the B-pillar on the driver's side of the vehicle (Y page 373). Permissible gross vehicle weight: the gross weight of the vehicle, all passengers, load and trailer load/noseweight (if applicable) must not exceed the permissible gross vehicle weight. Gross axle weight rating: the maximum permissible weight that can be carried by one axle (front or rear axle).
To ensure that your vehicle does not exceed the maximum permissible values (gross vehicle weight and maximum gross axle weight rating), have your loaded vehicle (including driver, occupants, cargo, and full trailer load if applicable) weighed on a suitable vehicle weighbridge.
All about wheels and tires Uniform Tire Quality Grading Standards Overview of Tire Quality Grading Standards
Uniform Tire Quality Grading Standards are U.S. government specifications. Their purpose is to provide drivers with uniform reliable information on tire performance data. Tire manufacturers have to grade tires using three performance factors: : tread wear grade, ; traction grade and = temperature grade. These regulations do not apply to Canada. Nevertheless, all tires sold in North America are provided with the corresponding quality grading markings on the sidewall of the tire. Where applicable, the tire grading information can be found on the tire sidewall between the tread shoulder and maximum tire width. Example: RTreadwear grade: 200
RTraction grade: AA RTemperature grade: AAll about wheels and tires
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All passenger car tires must conform to the statutory safety requirements in addition to these grades. i The actual values for tires are vehicle-
specific and may deviate from the values in the illustration.
Treadwear The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified U.S. government course. For example, a tire graded 150 would wear one and one-half times as well on the government course as a tire graded 100. The relative performance of tires depends upon the actual conditions of their use, however, and may depart significantly from the norm, due to variations in driving habits, service practices and differences in road characteristics and climate conditions.
Traction G WARNING The traction grade assigned to this tire is based on straight-ahead braking traction tests, and does not include acceleration, cornering, hydroplaning, or peak traction characteristics.
! Avoid wheelspin. This can lead to damage
to the drive train.
The traction grades, from highest to lowest, are AA, A, B, and C. Those grades represent the tire's ability to stop on a wet surface as measured under controlled conditions on specified government test surfaces of asphalt and concrete. A tire marked C may have poor traction performance. The safe speed on a wet, snow covered or icy road is always lower than on dry road surfaces. You should pay special attention to road conditions when temperatures are around freezing point.
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Mercedes-Benz recommends a minimum tread depth of ã in (4 mm) on all four winter tires. Observe the legally required minimum tire tread depth (Y page 363). Winter tires can reduce the braking distance on snow-covered surfaces in comparison with summer tires. The braking distance is still much further than on surfaces that are not icy or covered with snow. Take appropriate care when driving. Further information on winter tires (M+S tires) (Y page 364).
Temperature G WARNING The temperature grade for this tire is established for a tire that is properly inflated and not overloaded. Excessive speed, underinflation, or excessive loading, either separately or in combination, can cause excessive heat build-up and possible tire failure.
The temperature grades are A (the highest), B, and C. These represent the tire's resistance to the generation of heat and its ability to dissipate heat when tested under controlled conditions on a specified indoor laboratory test wheel. Sustained high temperature can cause the material of the tire to degenerate and reduce tire life, and excessive temperature can lead to sudden tire failure. The grade C corresponds to a level of performance which all passenger car tires must meet under the Federal Motor Vehicle Safety Standard No. 109. Grades B and A represent higher levels of performance on the laboratory test wheel than the minimum required by law.
Tire labeling Overview
: Uniform Tire Quality Grading Standard
; DOT, Tire Identification Number
(Y page 382)
(Y page 381)
= Maximum tire load (Y page 381) ? Maximum tire pressure (Y page 368) A Manufacturer B Tire material (Y page 382) C Tire size designation, load-bearing
capacity and speed index (Y page 378)
D Load index (Y page 381) E Tire name The markings described above are on the tire in addition to the tire name (sales designation) and the manufacturer's name. i Tire data is vehicle-specific and may deviate from the data in the example.
Tire size designation, load-bearing capacity and speed rating G WARNING Exceeding the stated tire load-bearing capacity and the approved maximum speed could lead to tire damage or the tire bursting. There is a risk of accident.
Therefore, only use tire types and sizes approved for your vehicle model. Observe the tire load rating and speed rating required for your vehicle.
: Tire width ; Nominal aspect ratio in % = Tire code ? Rim diameter A Load bearing index B Speed rating General: depending on the manufacturer's standards, the size imprinted in the tire wall may not contain any letters or may contain one letter that precedes the size description. If there is no letter preceding the size description (as shown above): these are passenger vehicle tires according to European manufacturing standards. If "P" precedes the size description: these are passenger vehicle tires according to U.S. manufacturing standards. If "LT" precedes the size description: these are light truck tires according to U.S. manufacturing standards. If "T" precedes the size description: these are compact emergency spare wheels at high tire pressure, to be used only temporarily in an emergency. Tire width: tire width : shows the nominal tire width in millimeters. Height-width ratio: aspect ratio ; is the size ratio between the tire height and tire width and is shown in percent. The aspect
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ratio is calculated by dividing the tire width by the tire height. Tire code: tire code = specifies the tire type. "R" represents radial tires; "D" represents diagonal tires; "B" represents diagonal radial tires. Optionally, tires with a maximum speed of over 149 mph (240 km/h) may have a “ZR” in the size description, depending on the manufacturer (e.g. 245/40 ZR 18). Rim diameter: rim diameter ? is the diameter of the bead seat, not the diameter of the rim flange. The rim diameter is specified in inches (in). Load-bearing index: load-bearing index A is a numerical code that specifies the maximum load-bearing capacity of a tire. Do not overload the tires by exceeding the specified load limit. The maximum permissible load can be found on the vehicle's Tire and Loading Information placard on the B-pillar on the driver's side (Y page 373). Example: The load bearing index 91 is equivalent to a maximum load of 1356 lb (615 kg) that the tire can carry. For further information on the maximum tire load in kilograms and lbs, see (Y page 381). For further information on the load bearing index, see "Load index" (Y page 381). Speed rating: speed rating B specifies the approved maximum speed of the tire. i Tire data is vehicle-specific and may deviate from the data in the example. Regardless of the speed rating, always observe the speed limits. Drive carefully and adapt your driving style to the traffic conditions. Summer tires Index
Speed rating up to 100 mph (160 km/h) up to 106 mph (170 km/h)
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Index ZR...Y ZR...(..Y) ZR
Speed rating up to 112 mph (180 km/h) up to 118mph (190 km/h) up to 130mph (210 km/h) up to 149 mph (240 km/h) up to 168 mph (270 km/h) up to 186mph (300 km/h) up to 186mph (300 km/h) over 186 mph (300 km/h) over 149 mph (240 km/h)
ROptionally, tires with a maximum speed of over 149 mph (240 km/h) may have a “ZR” in the size description, depending on the manufacturer (e.g. 245/40 ZR18). The service specification is made up of load-bearing index A and speed rating B.
RIf the size description of your tire includes
"ZR" and there are no service specifications, ask the tire manufacturer in order to find out the maximum speed. If a service specification is available, the maximum speed is limited according to the speed rating in the service specification. Example: 245/40 ZR 18 97 Y. In this example, "97 Y" is the service specification. The letter "Y" represents the speed rating and the maximum speed of the tire is limited to 186 mph (300km/h).
REvery tire that has a maximum speed of
more than 186 mph (300 km/h) must have a "ZR" in the size description and the service specification must be given in parentheses. Example: 275/40 ZR 18 (99 Y). The speed rating "(Y)" indicates that the maximum speed of the tire is over 186 mph (300 km/h). Ask the
4 Or M+Si for winter tires.
tire manufacturer about the maximum speed.
All-weather tires and winter tires Index Q M+S4
T M+S4
H M+S4
V M+S4Speed rating up to 100 mph (160 km/h) up to 118mph (190 km/h) up to 130mph (210 km/h) up to 149 mph (240 km/h)
i Not all tires with the M+S marking provide the driving characteristics of winter tires. In addition to the M+S marking, winter tires also have the i snowflake symbol on the tire wall. Tires with this marking fulfill the requirements of the Rubber Manufacturers Association (RMA) and the Rubber Association of Canada (RAC) regarding the tire traction on snow. They have been especially developed for driving on snow.
An electronic speed limiter prevents your vehicle from exceeding the following speeds: Rall vehicles (except AMG vehicles):
130 mph (210 km/h)
RAMG vehicles: 155 mph (250 km/h) RAMG vehicles with Performance Package
(Wagon): 174 mph (280 km/h)
RAMG vehicles with Performance Package
(Sedan): 186 mph (300 km/h)
The speed rating of tires mounted at the factory may be higher than the maximum speed that the electronic speed limiter permits. Make sure that your tires have the required speed rating, e.g. when buying new tires. The required speed rating for your vehicle can be found in the "Tires" section (Y page 389). Further information about reading tire data can be obtained from any qualified specialist workshop.
Load index
In addition to the load bearing index, load index : may be imprinted after the letters that identify speed index B on the sidewall of the tire (Y page 378). RIf no specification is given: no text (as in the
example above), represents a standard load (SL) tire
RXL or Extra Load: represents a reinforced
tire
RLight Load: represents a light load tire RC, D, E: represents a load range that
depends on the maximum load that the tire can carry at a certain pressure
i Tire data is vehicle-specific and may deviate from the data in the example.
Maximum load rating
Maximum tire load : is the maximum permissible weight for which the tire is approved. Do not overload the tires by exceeding the specified load limit. The maximum
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permissible load can be found on the vehicle's Tire and Loading Information placard on the B-pillar on the driver's side (Y page 373). i The actual values for tires are vehicle-
specific and may deviate from the values in the illustration.
DOT, Tire Identification Number (TIN) U.S. tire regulations prescribe that every tire manufacturer or retreader must imprint a TIN in or on the sidewall of every tire produced.
The TIN is a unique identification number. The TIN enables the tire manufacturers or retreaders to inform purchasers of recalls and other safety-relevant matters. It makes it possible for the purchaser to easily identify the affected tires. The TIN is made up of manufacturer identification code ;, tire size =, tire type code ? and manufacturing date A. DOT (Department of Transportation): tire symbol : indicates that the tire complies with the requirements of the U.S. Department of Transportation. Manufacturer identification code: manufacturer identification code ; provides details on the tire manufacturer. New tires have a code with two symbols. Retreaded tires have a code with four symbols. For further information about retreaded tires, see (Y page 362). Tire size: identifier = describes the tire size.
382 All about wheels and tires
Tire type code: tire type code ? can be used by the manufacturer as a code to describe specific characteristics of the tire. Date of manufacture: date of manufacture A provides information about the age of a tire. The first and second positions represent the week of manufacture, starting with "01" for the first calendar week. Positions three and four represent the year of manufacture. For example, a tire that is marked with "3208", was manufactured in week 32 in 2008. i Tire data is vehicle-specific and may deviate from the data in the example.
Tire characteristics
This information describes the type of tire cord and the number of layers in sidewall : and under tire tread ;. i Tire data is vehicle-specific and may deviate from the data in the example.
Definition of terms for tires and loading Tire ply composition and material used Describes the number of plies or the number of layers of rubber-coated fabric in the tire tread and sidewall. These are made of steel, nylon, polyester and other materials. Bar Metric unit for tire pressure. 14.5038 pounds per square inch (psi) and 100 kilopascals (kPa) are the equivalent of 1 bar.
DOT (Department of Transportation) DOT marked tires fulfill the requirements of the United States Department of Transportation. Normal occupant weight The number of occupants for which the vehicle is designed multiplied by 68 kilograms (150 lb). Uniform Tire Quality Grading Standards A uniform standard to grade the quality of tires with regards to tread quality, tire traction and temperature characteristics. Ratings are determined by tire manufacturers using U.S. government testing procedures. The ratings are molded into the sidewall of the tire. Recommended tire pressure The recommended tire pressure applies to the tires mounted at the factory. The Tire and Loading Information placard contains the recommended tire pressures for cold tires on a fully loaded vehicle and for the maximum permissible vehicle speed. The tire pressure table contains the recommended pressures for cold tires for various operating conditions, i.e. differing load and speed conditions. Increased vehicle weight due to optional equipment This is the combined weight of all standard and optional equipment available for the vehicle, regardless of whether it is actually installed on the vehicle or not. Rim This is the part of the wheel on which the tire is mounted. GAWR (Gross Axle Weight Rating) The GAWR is the maximum gross axle weight rating. The actual load on an axle must never exceed the gross axle weight rating. The gross axle weight rating can be found on the vehicle identification plate on the B-pillar on the driver's side.
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Speed rating The speed rating is part of the tire identification. It specifies the speed range for which the tire is approved. GVW (Gross Vehicle Weight) The gross vehicle weight includes the weight of the vehicle including fuel, tools, the spare wheel, accessories installed, occupants, luggage and the drawbar noseweight, if applicable. The gross vehicle weight must not exceed the gross vehicle weight rating GVWR as specified on the vehicle identification plate on the B-pillar on the driver's side. GVWR (Gross Vehicle Weight Rating) The GVWR is the maximum permissible gross weight of a fully loaded vehicle (the weight of the vehicle including all accessories, occupants, fuel, luggage and the drawbar noseweight, if applicable). The gross vehicle weight rating is specified on the vehicle identification plate on the B-pillar on the driver's side. Maximum loaded vehicle weight The maximum weight is the sum of: Rthe curb weight of the vehicle Rthe weight of the accessories Rthe load limit Rthe weight of the factory installed optional
equipment
Kilopascal (kPa) Metric unit for tire pressure. 6.9 kPa corresponds to 1 psi. Another unit for tire pressure is bar. There are 100 kilopascals (kPa) to 1 bar. Load index In addition to the load-bearing index, the load index may also be imprinted on the sidewall of the tire. This specifies the load-bearing capacity more precisely.
Curb weight The weight of a vehicle with standard equipment including the maximum capacity of fuel, oil and coolant. It also includes the air- conditioning system and optional equipment if these are installed in the vehicle, but does not include passengers or luggage. Maximum load rating The maximum tire load is the maximum permissible weight in kilograms or lbs for which a tire is approved. Maximum permissible tire pressure Maximum permissible tire pressure for one tire. Maximum load on one tire Maximum load on one tire. This is calculated by dividing the maximum axle load of one axle by two. PSI (pounds per square inch) A standard unit of measure for tire pressure. Aspect ratio Relationship between tire height and tire width in percent. Tire pressure This is pressure inside the tire applying an outward force to each square inch of the tire's surface. The tire pressure is specified in pounds per square inch (psi), in kilopascal (kPa) or in bar. The tire pressure should only be corrected when the tires are cold. Cold tire pressure The tires are cold: Rif the vehicle has been parked without
direct sunlight on the tires for at least three hours and
Rif the vehicle has been driven for less than
1 mile (1.6 km).
384 Changing a wheel
Tread The part of the tire that comes into contact with the road. Bead The tire bead ensures that the tire sits securely on the wheel. There are several steel wires in the bead to prevent the tire from coming loose from the wheel rim. Sidewall The part of the tire between the tread and the bead. Weight of optional extras The combined weight of those optional extras that weigh more than the replaced standard parts and more than 2.3 kilograms (5 lbs). These optional extras, such as high- performance brakes, level control, a roof rack or a high-performance battery, are not included in the curb weight and the weight of the accessories. TIN (Tire Identification Number) This is a unique identifier which can be used by a tire manufacturer to identify tires, for example for a product recall, and thus identify the purchasers. The TIN is made up of the manufacturer's identity code, tire size, tire type code and the manufacturing date. Load bearing index The load bearing index (also load index) is a code that contains the maximum load bearing capacity of a tire. Traction Traction is the result of friction between the tires and the road surface. Treadwear indicators Narrow bars (tread wear bars) that are distributed over the tire tread. If the tire tread is level with the bars, the wear limit of á in (1.6 mm) has been reached.
Occupant distribution The distribution of occupants in a vehicle at their designated seating positions. Total load limit Rated cargo and luggage load plus 68 kilograms (150 lb) multiplied by the number of seats in the vehicle.
