2016 GMC Savana Owners Manual

depending on brake usage. TCS may activate on dry or rough roads or under conditions such as heavy acceleration while turning or abrupt upshifts/downshifts of the transmission. When this reduction in acceleration occurs, it may be noticed, or a noise or vibration may be heard. This is normal. Adding non-dealer accessories can affect the vehicle's performance. See Accessories and Modifications 0 213.

Locking Rear Axle Vehicles with a locking rear axle can give more traction on snow, mud, ice, sand, or gravel. It works like a standard axle most of the time, but when traction is low, this feature will allow the rear wheel with the most traction to move the vehicle.

Cruise Control { Warning

Cruise control can be dangerous where you cannot drive safely at a steady speed. Do not use cruise control on winding roads or in heavy traffic. Cruise control can be dangerous on slippery roads. On such roads, fast changes in tire traction can cause excessive wheel slip, and you could lose control. Do not use cruise control on slippery roads.

If equipped with cruise control, a speed of about 40 km/h (25 mph) or more can be maintained without keeping your foot on the accelerator. Cruise control does not work at speeds below about 40 km/h (25 mph). If the vehicle has StabiliTrak and the system begins to limit wheel spin, cruise control will automatically disengage. See Traction Control/ Electronic Stability Control 0 188.

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When road conditions allow cruise control to be safely used again, cruise control can be turned back on. If the brakes are applied, cruise control disengages.

I (On/Off) : Press to turn cruise control on or off. The white indicator comes on in the instrument cluster when cruise control is turned on. +RES (Resume/Accelerate) : If there is a set speed in memory, press briefly to resume to a previously set speed, or press and

hold to accelerate. If cruise control is already active, use to increase vehicle speed. SET− (Set/Coast) : Press briefly to set the speed and activate cruise control, or press and hold to decelerate. If cruise control is already active, use to decrease vehicle speed. [ (Cancel) : Press to disengage cruise control without erasing the set speed from memory.

Setting Cruise Control If I is on when not in use, the SET− or +RES button could get pressed and go into cruise when not desired. Keep I off when cruise is not being used. 1. Press I to turn the cruise

system on.

2. Get up to the desired speed. 3. Press and release SET−. The

desired set speed briefly appears in the instrument cluster.

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191

4. Remove your foot from the

accelerator.

The cruise control indicator on the instrument cluster turns green after cruise control has been set to the desired speed. See Instrument Cluster 0 93.

Resuming a Set Speed If the cruise control is set at a desired speed and then the brakes are applied, the cruise control is disengaged without erasing the set speed from memory. Once the vehicle speed reaches about 40 km/h (25 mph) or more, briefly press +RES. The vehicle returns to the previous set speed.

Increasing Speed While Using Cruise Control If the cruise control system is already activated: . Press and hold +RES until the desired speed is reached, then release it.

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. To increase vehicle speed in

small increments, briefly press +RES. For each press, the vehicle goes about 1.6 km/h (1 mph) faster.

The speedometer reading can be displayed in either English or metric units. See Driver Information Center (DIC) 0 105. The increment value used depends on the units displayed.

Reducing Speed While Using Cruise Control If the cruise control system is already activated: . Press and hold SET– until the

desired lower speed is reached, then release it.

. To decrease the vehicle speed in

small increments, briefly press SET–. For each press, the vehicle goes about 1.6 km/h (1 mph) slower.

The speedometer reading can be displayed in either English or metric units. See Driver Information Center (DIC) 0 105. The increment value used depends on the units displayed.

Passing Another Vehicle While Using Cruise Control Use the accelerator pedal to increase the vehicle speed. When you take your foot off the pedal, the vehicle will slow down to the previous set cruise speed. While pressing the accelerator pedal or shortly following the release to override cruise control, briefly pressing SET– will result in cruise set to the current vehicle speed.

Using Cruise Control on Hills How well cruise control works on hills depends on the vehicle speed, load, and the steepness of the hills. When going up steep hills, you might have to step on the accelerator pedal to maintain your speed.

While going downhill: . Vehicles with a 4-speed

automatic transmission may need to have the brakes applied or the transmission shifted to a lower gear to help maintain driver selected speed.

. Vehicles with a 6-speed

automatic transmission have Cruise Grade Braking to help maintain driver selected speed.

Cruise Grade Braking is enabled when the vehicle is started and cruise control is active. It is not enabled in Range Selection Mode. It assists in maintaining driver selected speed when driving on downhill grades by using the engine and transmission to slow the vehicle. To disable and enable Cruise Grade Braking for the current ignition key cycle, press and hold the Tow/Haul button for three seconds. A DIC message displays. See Transmission Messages 0 116. When the brakes are applied the cruise control is disengaged.

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Ending Cruise Control There are four ways to end cruise control: . Step lightly on the brake pedal. . Press [. . Shift the transmission to

N (Neutral).

. To turn off cruise control,

press I.

Erasing Speed Memory The cruise control set speed is erased from memory if I is pressed or if the vehicle is turned off.

Driver Assistance Systems

Rear Vision Camera (RVC) If equipped, the RVC system is designed to help the driver when backing up by displaying a view of the area behind the vehicle.

{ Warning

The camera(s) do not display children, pedestrians, bicyclists, crossing traffic, animals, or any other object outside of the cameras’ field of view, below the bumper, or under the vehicle. Shown distances may be different from actual distances. Do not drive or park the vehicle using only these camera(s). Always check behind and around the vehicle before driving. Failure to use proper care may result in injury, death, or vehicle damage.

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Vehicles without Navigation System When the vehicle is on and shifted into R (Reverse), the video image appears on the inside rearview mirror. The video image disappears after the vehicle is shifted out of R (Reverse). Vehicles with Navigation System When the vehicle is shifted into R (Reverse), the video image appears on the navigation screen. After a delay, the navigation screen displays the previous screen after the vehicle is shifted out of R (Reverse). The delay that is received after shifting out of R (Reverse) is approximately 10 seconds. Return to the previous screen sooner by performing one of the following: . Press a hard key on the

navigation system. . Shift into P (Park). . Reach a vehicle speed of

8 km/h (5 mph).

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Symbols and Guidelines The navigation system may have a feature that allows for viewing parking assist symbols and/or guidelines on the navigation screen while using the RVC. The Rear Parking Assist (RPA) system must not be disabled to use the caution symbols. If RPA has been disabled and the symbols have been turned on, the Rear Parking Assist Symbols Unavailable error message may display. See Parking Assist 0 195. The symbols appear near objects detected by the RPA system. The symbol may cover the object when viewing the navigation screen. The guideline overlay can help the driver align the vehicle when backing into a parking spot. To turn the symbols or guidelines on or off: 1. Shift into P (Park). 2. Press MENU to enter the

configure menu options. Turn the Multifunction knob until the Display feature is highlighted

and press the Multifunction knob; or press the Display screen button.

3. Select the Rear Camera

Options screen button. The Rear Camera Options screen displays.

4. Touch the Symbols or

Guidelines screen button. The screen button will be highlighted when the feature is on.

RVC Location

This shows the field of view that the camera provides.

1. View displayed by the

camera

The camera is above the license plate.

1. View displayed by the

camera

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2. Corners of the rear bumper Displayed images may be further or closer than they appear. The area displayed is limited and objects that are close to either corner of the bumper or under the bumper do not display. When the System Does Not Seem To Work Properly The RVC system might not work properly or display a clear image if: . The sun or the beam of

It is dark.

headlamps is shining directly into the camera lens. Ice, snow, mud, or anything else builds up on the camera lens. Clean the lens, rinse it with water, and wipe it with a soft cloth.

. The back of the vehicle is in an

accident. The position and mounting angle of the camera can change or the camera can be affected. Be sure to have the

camera and its position and mounting angle checked at your dealer.

The RVC system display in the rearview mirror may turn off or not appear as expected due to one of the following conditions. If this occurs, the left indicator light on the mirror will flash. . A slow flash may indicate a loss

of video signal, or no video signal present during the reverse cycle.

. A fast flash may indicate that the

display has been on for the maximum allowable time during a reverse cycle, or the display has reached an Over Temperature limit. The fast flash conditions are used to protect the video device from high temperature conditions. Once conditions return to normal, the device will reset and the indicator will stop flashing.

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195

During any of these fault conditions, the display will be blank and the indicator will flash while the vehicle is in R (Reverse) or until the conditions return to normal.

Parking Assist If equipped, the Rear Parking Assist (RPA) system uses sensors on the rear bumper to assist with parking and avoiding objects while in R (Reverse).

{ Warning

The parking assist system does not detect children, pedestrians, bicyclists, animals, or objects below the bumper or that are too close or too far from the vehicle. It is not available at speeds greater than 8 km/h (5 mph). To prevent injury, death, or vehicle damage, even with parking assist, always check the area around the vehicle and check all mirrors before backing.

cycle. RPA will return to normal operation after it is determined the object is removed. This could take a few drive cycles.

. A tow bar is attached to the

vehicle.

Other conditions may affect system performance, such as vibrations from a jackhammer or the compression of air brakes on a very large truck.

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How the System Works RPA comes on automatically when the shift lever is moved into R (Reverse). A single beep sounds to indicate the system is working. RPA operates only at speeds less than 8 km/h (5 mph). An obstacle detection is indicated by beeps. The time between beeps gets shorter as the vehicle approaches the obstacle. Repeated beeps are heard when the distance is less than 30 cm (12 in). To be detected, objects must be at least 25 cm (10 in) off the ground and below rear door level. Objects must also be within 2.5 m (8 ft) from the rear bumper. This distance may be less during warmer or humid weather. Turning the System On and Off The system can be disabled through the Driver Information Center (DIC). See “Park Assist” under Driver Information Center (DIC) 0 105. RPA defaults to the on setting each time the vehicle is started.

Turn RPA off when towing a trailer. When the System Does Not Seem to Work Properly The following messages may be displayed on the DIC: SERVICE PARK ASSIST : If this message occurs, take the vehicle to your dealer for repair. PARK ASSIST OFF : This message occurs if the driver disables the system or if the vehicle is driven above 8 km/h (5 mph) in R (Reverse). PARK ASST BLOCKED SEE OWNERS MANUAL : This message can occur under the following conditions: . The sensors are not clean. Keep

the rear bumper free of mud, dirt, snow, ice, slush, and frost. The message may not clear until frost or ice has melted all around and inside the sensor.

. A trailer is attached to the

vehicle, or a bicycle or an object hanging out of the rear door during the current or last drive

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Fuel For diesel engine vehicles, see “Fuel for Diesel Engines” in the Duramax diesel supplement. For gasoline engine vehicles, use of the recommended fuel is an important part of the proper maintenance of this vehicle. When driving in the U.S. and Canada, to help keep the engine clean and maintain optimum vehicle performance, we recommend using TOP TIER Detergent Gasolines. See www.toptiergas.com for a list of TOP TIER Detergent Gasolines.

If the vehicle has a yellow fuel cap, E85 or FlexFuel can be used in the vehicle. See E85 or FlexFuel 0 198. Use regular unleaded gasoline meeting ASTM specification D4814
with a posted octane rating of 87 or higher. Do not use gasoline with an octane rating below 87; as it may cause engine damage and will lower fuel economy.

Use of Seasonal Fuels Use summer and winter fuels in the appropriate season. The fuels industry automatically modifies the fuel for the appropriate season. If fuel is left in the vehicle tank for long periods of time, driving or starting could be affected. Drive the vehicle until the fuel is at one-half tank or less, then refuel with the current seasonal fuel.

Prohibited Fuels Gasolines containing oxygenates such as ethers and ethanol, as well as reformulated gasolines, are available in some cities. If these gasolines comply with the previously described specification,

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197

then they are acceptable to use. However, E85 (85% ethanol) and other fuels containing more than 15% ethanol must be used only in FlexFuel vehicles.

Caution

Do not use fuel containing methanol. It can corrode metal parts in the fuel system and also damage plastic and rubber parts. That damage would not be covered under the vehicle warranty.

Some gasolines, mainly high octane racing gasolines, can contain an octane-enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT). Do not use gasolines and/or fuel additives with MMT as they can reduce spark plug life and affect emission control system performance. The malfunction indicator lamp may turn on. If this occurs, see your dealer for service.

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California Fuel Requirements If the vehicle is certified to meet California Emissions Standards, it is designed to operate on fuels that meet California specifications. See the underhood emission control label. If this fuel is not available in states adopting California Emissions Standards, the vehicle will operate satisfactorily on fuels meeting federal specifications, but emission control system performance might be affected. The malfunction indicator lamp could turn on and the vehicle may not pass a smog-check test. See Malfunction Indicator Lamp (Check Engine Light) 0 100. If this occurs, return to your authorized dealer for diagnosis. If it is determined that the condition is caused by the type of fuel used, repairs may not be covered by the vehicle warranty.

Fuels in Foreign Countries If planning to drive in countries outside the U.S. or Canada, the proper fuel might be hard to find. Check regional auto club or fuel retail brand websites for availability in the country where driving. Never use leaded gasoline, fuel containing methanol, manganese, or any other fuel not recommended. Costly repairs caused by use of improper fuel would not be covered by the vehicle warranty.

Fuel Additives To keep fuel systems clean, TOP TIER Detergent Gasoline is recommended. See Fuel 0 197. If TOP TIER Detergent Gasoline is not available, one bottle of Fuel System Treatment PLUS added to the fuel tank at every engine oil change can help. Fuel System Treatment PLUS is the only gasoline additive recommended by General Motors. It is available at your dealer.

Do not use additives with E85 or FlexFuel.

E85 or FlexFuel Vehicles with a yellow fuel cap can use either unleaded gasoline or fuel containing up to 85% ethanol (E85). All other vehicles should use only the unleaded gasoline as described in Fuel 0 197. The use of E85 or FlexFuel is encouraged when the vehicle is designed to use it. E85 or FlexFuel is made from renewable sources. To help locate fuel stations that carry E85 or FlexFuel, the U.S. Department of Energy has an alternative fuels website. See www.afdc.energy.gov/afdc/locator/ stations. E85 or FlexFuel should meet ASTM Specification D 5798 or CAN/ CGSB–3.512 in Canada. Do not use the fuel if the ethanol content is greater than 85%. Fuel mixtures that do not meet ASTM or CGSB specifications can affect driveability and could cause the malfunction indicator lamp to come on.

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After refueling, the vehicle calculates the composition of the fuel. It is not recommended to repeatedly switch between fuels. If fuels are switched frequently, add as much fuel as possible and do not add less than 11 L (3 gal) when refueling. Drive at least 11 km (7 mi) immediately after refueling to allow the vehicle to adapt to the change in ethanol concentration. Because E85 or FlexFuel has less energy per liter (gallon) than gasoline, the vehicle will need to be refilled more often. See Filling the Tank 0 199.

Caution

Some additives are not compatible with E85 or FlexFuel and can harm the vehicle's fuel system. Do not add anything to E85 or FlexFuel. Damage caused by additives would not be covered by the vehicle warranty.

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199

Caution

Warning (Continued)

. Do not leave the fuel pump

unattended.

. Do not use a cell phone

while refueling.

. Do not reenter the vehicle

while pumping fuel.

. Keep children away from

the fuel pump and never let children pump fuel.

. Fuel can spray out if the fuel

cap is opened too quickly. This spray can happen if the tank is nearly full, and is more likely in hot weather. Open the fuel cap slowly and wait for any hiss noise to stop, then unscrew the cap all the way.

Do not use fuel containing methanol. It can corrode metal parts in the fuel system and also damage plastic and rubber parts. That damage would not be covered under the vehicle warranty.

Filling the Tank

{ Warning

Fuel vapors and fuel fires burn violently and can cause injury or death.

. To help avoid injuries to you and others, read and follow all the instructions on the fuel pump island.

. Turn off the engine when

refueling.

. Keep sparks, flames, and

smoking materials away from fuel.

(Continued)

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{ Warning

{ Warning

If a fire starts while you are refueling, do not remove the nozzle. Shut off the flow of fuel by shutting off the pump or by notifying the station attendant. Leave the area immediately.

Caution

If a new fuel cap is needed, be sure to get the right type of cap from your dealer. The wrong type of fuel cap may not fit properly, may cause the malfunction indicator lamp to light, and could damage the fuel tank and emissions system. See Malfunction Indicator Lamp (Check Engine Light) 0 100.

Overfilling the fuel tank by more than three clicks of a standard fill nozzle may cause:

. Vehicle performance issues, including engine stalling and damage to the fuel system.

. Fuel spills. . Potential fuel fires.

Be careful not to spill fuel. Wait a few seconds after you have finished pumping before removing the nozzle. Clean fuel from painted surfaces as soon as possible. See Exterior Care 0 285. When replacing the fuel cap, turn it clockwise until it clicks. Make sure the cap is fully installed. The diagnostic system can determine if the fuel cap has been left off or improperly installed. This would allow fuel to evaporate into the atmosphere. See Malfunction Indicator Lamp (Check Engine Light) 0 100.

The fuel cap is behind a hinged fuel door on the driver side of the vehicle. If the vehicle has E85 fuel capability, the fuel cap will be yellow and state that E85 or gasoline can be used. See E85 or FlexFuel 0 198. To remove the fuel cap, turn it slowly counterclockwise. While refueling, hang the tethered fuel cap from the hook on the fuel door.

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Filling a Portable Fuel Container

{ Warning

Filling a portable fuel container while it is in the vehicle can cause fuel vapors that can ignite either by static electricity or other means. You or others could be badly burned and the vehicle could be damaged. Always:

. Use approved fuel

containers.

. Remove the container from the vehicle, trunk, or pickup bed before filling.

. Place the container on the

ground.

. Place the nozzle inside the fill opening of the container before dispensing fuel, and keep it in contact with the fill opening until filling is complete.

(Continued)

Warning (Continued)

. Fill the container no more than 95% full to allow for expansion.

. Do not smoke, light

matches, or use lighters while pumping fuel.

. Avoid using cell phones or

other electronic devices.

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Trailer Towing

General Towing Information Only use towing equipment that has been designed for the vehicle. Contact your dealer or trailering dealer for assistance with preparing the vehicle for towing a trailer. Read the entire section before towing a trailer. For towing a disabled vehicle, see Towing the Vehicle 0 283. For towing the vehicle behind another vehicle such as a motor home, see Recreational Vehicle Towing 0 284.

Driving Characteristics and Towing Tips

Driving with a Trailer When towing a trailer: . Become familiar with the state

and local laws that apply to trailer towing.

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. Do not tow a trailer during the first 800 km (500 mi) to prevent damage to the engine, axle, or other parts.

. Then during the first 800 km

(500 mi) of trailer towing, do not drive over 80 km/h (50 mph) and do not make starts at full throttle.

. Vehicles can tow in D (Drive).

Shift the transmission to a lower gear if the transmission shifts too often under heavy loads and/ or hilly conditions.

. Turn off Park Assist when

towing.

{ Warning

When towing a trailer, exhaust gases may collect at the rear of the vehicle and enter if the liftgate, trunk/hatch, or rear-most window is open. When towing a trailer:

(Continued)

Warning (Continued)

. Do not drive with the liftgate, trunk/hatch, or rear-most window open. . Fully open the air outlets on

or under the instrument panel.

. Also adjust the climate

control system to a setting that brings in only outside air. See “Climate Control Systems” in the Index. For more information about Carbon Monoxide, see Engine Exhaust 0 181.

Towing a trailer requires a certain amount of experience. The combination you are driving is longer and not as responsive as the vehicle itself. Get acquainted with the handling and braking of the rig before setting out for the open road. Before starting, check all trailer hitch parts and attachments, safety chains, electrical connectors, lamps, tires, and mirrors. If the trailer has

electric brakes, start the combination moving and then apply the trailer brake controller by hand to be sure the brakes work. During the trip, check occasionally to be sure that the load is secure and the lamps and any trailer brakes still work. Following Distance Stay at least twice as far behind the vehicle ahead as you would when driving the vehicle without a trailer. This can help to avoid heavy braking and sudden turns. Passing More passing distance is needed when towing a trailer. The combination will not accelerate as quickly and is longer so it is necessary to go much farther beyond the passed vehicle before returning to the lane. Backing Up Hold the bottom of the steering wheel with one hand. To move the trailer to the left, move that hand to the left. To move the trailer to the

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right, move your hand to the right. Always back up slowly and, if possible, have someone guide you. Making Turns

Caution

Making very sharp turns while trailering could cause the trailer to come in contact with the vehicle. The vehicle could be damaged. Avoid making very sharp turns while trailering.

When turning with a trailer, make wider turns than normal. Do this so the trailer will not strike soft shoulders, curbs, road signs, trees, or other objects. Avoid jerky or sudden maneuvers. Signal well in advance. If the trailer turn signal bulbs burn out, the arrows on the instrument cluster will still flash for turns. It is important to check occasionally to be sure the trailer bulbs are still working.

Driving on Grades Reduce speed and shift to a lower gear before starting down a long or steep downgrade. If the transmission is not shifted down, the brakes might get hot and no longer work well. Vehicles can tow in D (Drive). Shift the transmission to a lower gear if the transmission shifts too often under heavy loads and/or hilly conditions. The Tow/Haul Mode may be used if the transmission shifts too often. See Tow/Haul Mode 0 186. When towing at high altitude on steep uphill grades, consider the following: Engine coolant will boil at a lower temperature than at normal altitudes. If the engine is turned off immediately after towing at high altitude on steep uphill grades, the vehicle may show signs similar to engine overheating. To avoid this, let the engine run while parked, preferably on level ground, with the transmission in P (Park) for a few

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203

minutes before turning the engine off. If the overheat warning comes on, see Engine Overheating 0 228. Parking on Hills

{ Warning

Parking the vehicle on a hill with the trailer attached can be dangerous. If something goes wrong, the rig could start to move. People can be injured, and both the vehicle and the trailer can be damaged. When possible, always park the rig on a flat surface.

If parking the rig on a hill: 1. Press the brake pedal, but do not shift into P (Park) yet. Turn the wheels into the curb if facing downhill or into traffic if facing uphill.

2. Have someone place chocks

under the trailer wheels.

3. When the wheel chocks are in

place, release the regular brakes until the chocks absorb the load.

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4. Reapply the brake pedal. Then

apply the parking brake and shift into P (Park).

5. Release the brake pedal. Leaving After Parking on a Hill 1. Apply and hold the brake

pedal.

2. Start the engine. 3. Shift into a gear. 4. Release the parking brake. 5. Let up on the brake pedal. 6. Drive slowly until the trailer is

clear of the chocks.

7. Stop and have someone pick

up and store the chocks. Maintenance when Trailer Towing The vehicle needs service more often when pulling a trailer. See Maintenance Schedule 0 295. Things that are especially important in trailer operation are automatic transmission fluid, engine oil, axle lubricant, belts, cooling system, and

brake system. It is a good idea to inspect these before and during the trip. Check periodically to see that all hitch nuts and bolts are tight.

Trailer Towing If the vehicle has a diesel engine, see the Duramax diesel supplement.

{ Warning

The driver can lose control when pulling a trailer if the correct equipment is not used or the vehicle is not driven properly. For example, if the trailer is too heavy, the brakes may not work well — or even at all. The driver and passengers could be seriously injured. The vehicle may also be damaged; the resulting repairs would not be covered by the vehicle warranty. Pull a trailer only if all the steps in this section have been followed. Ask your

(Continued)

Warning (Continued)

dealer for advice and information about towing a trailer with the vehicle.

Caution

Pulling a trailer improperly can damage the vehicle and result in costly repairs not covered by the vehicle warranty. To pull a trailer correctly, follow the advice in this section and see your dealer for important information about towing a trailer with the vehicle.

To identify the trailering capacity of the vehicle, read the information in “Weight of the Trailer” following. Trailering is different than just driving the vehicle by itself. Trailering means changes in handling, acceleration, braking, durability, and fuel economy.

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205

equipment, passengers,and cargo in the tow vehicle must be subtracted from the maximum trailer weight. Use the following chart to determine how much the vehicle can weigh, based upon the vehicle model and options.

Successful, safe trailering takes correct equipment, and it has to be used properly. The following information has many time-tested, important trailering tips and safety rules. Many of these are important for your safety and that of your passengers. So please read this section carefully before pulling a trailer. Weight of the Trailer How heavy can a trailer safely be? It depends on how the rig is used. For example, speed, altitude, road grades, outside temperature, and how much the vehicle is used to pull a trailer are all important. It can depend on any special equipment on the vehicle, and the amount of tongue weight the vehicle can carry. See “Weight of the Trailer Tongue” later in this section. Maximum trailer weight is calculated assuming only the driver is in the tow vehicle and it has all the required trailering equipment. The weight of additional optional

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Driving and Operating

Vehicle G2500 Cargo Van 2WD Short Wheelbase

4.8L V8
6.0L V8

G2500 Cargo Van 2WD Long Wheelbase

4.8L V8
6.0L V8

G2500 Passenger Van 2WD Short Wheelbase

4.8L V8
6.0L V8

G3500 Cargo Van 2WD Short Wheelbase

4.8L V8
6.0L V8

G3500 Cargo Van 2WD Long Wheelbase

4.8L V8
6.0L V8

G3500 Passenger Van 2WD Short Wheelbase

4.8L V8
6.0L V8

Axle Ratio

Maximum Trailer Weight

GCWR*

3.42
3.42

3.42
3.42

3.42
3.42

3.42
3.42

3.42
3.42

3.42
3.42

4 037 kg (8,900 lb) 4 536 kg (10,000 lb)

6 623 kg (14,600 lb) 7 257 kg (16,000 lb)

3 719 kg (8,200 lb) 4 536 kg (10,000 lb)

6 623 kg (14,600 lb) 7 257 kg (16,000 lb)

3 946 kg (8,700 lb) 4 355 kg (9,600 lb)

6 623 kg (14,600 lb) 7 257 kg (16,000 lb)

4 037 kg (8,900 lb) 4 536 kg (10,000 lb)

6 623 kg (14,600 lb) 7 257 kg (16,000 lb)

3 946 kg (8,700 lb) 4 536 kg (10,000 lb)

6 623 kg (14,600 lb) 7 257 kg (16,000 lb)

3 719 kg (8,200 lb) 4 355 kg (9,600 lb)

6 623 kg (14,600 lb) 7 257 kg (16,000 lb)

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Vehicle G3500 Passenger Van 2WD Long Wheelbase

Axle Ratio

Maximum Trailer Weight

GCWR*

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207

4.8L V8
6.0L V8

6 623 kg (14,600 lb) 7 257 kg (16,000 lb) *The Gross Combined Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle and trailer including any passengers, cargo, equipment, and conversion. The GCWR for the vehicle should not be exceeded.

3 583 kg (7,900 lb) 4 218 kg (9,300 lb)

3.42
3.42

Ask your dealer for trailering information or advice. Weight of the Trailer Tongue The tongue load (1) of any trailer is an important weight to measure because it affects the total gross weight of the vehicle. The Gross Vehicle Weight (GVW) includes the curb weight of the vehicle, any cargo carried in it, and the people who will be riding in the vehicle. If there are a lot of options, equipment, passengers, or cargo in the vehicle, it will reduce the tongue weight the vehicle can carry, which will also reduce the trailer weight the vehicle can tow. If towing a trailer, the tongue load must be added to

the GVW because the vehicle will be carrying that weight, too. See Vehicle Load Limits 0 170 for more information about the vehicle's maximum load capacity.

The trailer tongue weight (1) should be 10 percent to 15 percent of the total loaded trailer weight (2), up to a maximum of 181 kg (400 lb) with a weight carrying hitch. The trailer tongue weight (1) should be 10 percent to 15 percent of the total loaded trailer weight (2), up to a maximum of 454 kg (1,000 lb) with a weight distributing hitch. Do not exceed the maximum allowable tongue weight for the vehicle. Choose the shortest hitch extension that will position the hitch ball closest to the vehicle. This will help reduce the effect of trailer tongue weight on the rear axle.

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After loading the trailer, weigh the trailer and then the tongue, separately, to see if the weights are proper. If they are not, adjustments might be made by moving some items around in the trailer. Trailering may be limited by the vehicle's ability to carry tongue weight. Tongue weight cannot cause the vehicle to exceed the GVWR (Gross Vehicle Weight Rating) or the RGAWR (Rear Gross Axle Weight Rating). The effect of additional weight may reduce the trailering capacity more than the total of the additional weight. It is important that the vehicle does not exceed any of its ratings — GCWR, GVWR, RGAWR, Maximum Trailer Rating, or Tongue Weight. The only way to be sure it is not exceeding any of these ratings is to weigh the vehicle and trailer. Total Weight on the Vehicle's Tires Be sure the vehicle tires are inflated to the upper limit for cold tires. These numbers can be found on the Certification label at the rear edge of

the driver door, or see Vehicle Load Limits 0 170. Make sure not to go over the GVW limit for the vehicle, or the GAWR, including the weight of the trailer tongue. If using a weight distributing hitch, make sure not to go over the rear axle limit before applying the weight distribution spring bars.

Towing Equipment

Hitches The correct hitch equipment helps maintain combination control. Many trailers can be towed with a weight-carrying hitch which simply features a coupler latched to the hitch ball, or a tow eye latched to a pintle hook. Other trailers may require a weight-distributing hitch that uses spring bars to distribute the trailer tongue weight among the two vehicle and trailer axles. See “Weight of the Trailer Tongue” under Trailer Towing 0 204 for rating limits with various hitch types.

Consider using sway controls with any trailer. Ask a trailering professional about sway controls or refer to the trailer manufacturer's recommendations and instructions. Weight-Distributing Hitches and Weight Carrying Hitches A weight distributing hitch may be useful with some trailers. Use the following guidelines to determine if a weight distributing hitch should be used.

1. Front of Vehicle 2. Body to Ground Distance

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When using a weight-distributing hitch, the hitch must be adjusted so the distance (2) remains the same both before and after coupling the trailer to the tow vehicle. Safety Chains Always attach chains between the vehicle and the trailer. Cross the safety chains under the tongue of the trailer to help prevent the tongue from contacting the road if it becomes separated from the hitch. Always leave just enough slack so the rig can turn. Never allow safety chains to drag on the ground. Trailer Brakes A loaded trailer that weighs more than 680 kg (1,500 lb) needs to have its own brake system that is adequate for the weight of the trailer. Be sure to read and follow the instructions for the trailer brakes so they are installed, adjusted and maintained properly.

Trailer Wiring Harness The optional heavy-duty trailer wiring package includes a wiring harness, with a seven-pin connector at the rear of the vehicle and a four-wire harness assembly under the driver side of the instrument panel. The four-wire harness assembly comes without a connector. If the vehicle does not have a trailer hitch, the seven-wire harness assembly with connector is taped together and located in a frame pocket at the driver side rear left corner of the frame. If the vehicle has a trailer hitch, the seven-wire harness assembly with connector is attached to a bracket on the hitch platform. In both cases, the seven-wire harness has a connector and includes a 30-amp feed wire. The seven-wire harness connector contains the following trailer circuits: . Light Green: Back-up Lamps

(10A fuse)**

. White: Ground

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209

. Dark Blue: Trailer Brake Signal . Dark Green: Right Rear Stop

and Turn Signal*

. Red/Black Stripe: Battery Feed

(30A Fuse)

. Brown: Trailer Park Lamp

Supply Voltage (15A fuse)**

. Yellow: Left Rear Stop and Turn

Signal *

The four-wire harness (without connector) contains the following circuits: . Black: Ground . Red/White: Battery Feed . Dark Blue: Trailer Brake Signal . Light Blue: CHMSL/Stoplamp

Supply Voltage

* If the vehicle is a cutaway with trailer provisions, a 15 amp fuse will be shared for both left/stop trailer turn and right/stop trailer turn signals. However, the cutaway lighting connector will have a 10 amp fuse for each signal.

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** If the vehicle is a cutaway with trailer provisions, a 15 amp fuse will be shared for trailer park lamps and cutaway rear lighting connector park lamps. Also, a 10 amp fuse will be shared for trailer back-up lamps and cutaway rear lighting connector back-up lamps. Tow/Haul Mode This button is on the instrument panel, to the right of the steering wheel. Pressing this button turns on and off the Tow/Haul Mode.

This indicator light on the instrument cluster comes on when the Tow/ Haul Mode is on.

Tow/Haul is a feature that assists when pulling a heavy trailer or a large or heavy load. See Tow/Haul Mode 0 186. Tow/Haul is designed to be most effective when the vehicle and trailer combined weight is at least 75 percent of the vehicle Gross Combined Weight Rating (GCWR). See “Weight of the Trailer” in Trailer Towing 0 204. Tow/Haul is most useful under the following driving conditions: . When pulling a heavy trailer or a

large or heavy load through rolling terrain.

. When pulling a heavy trailer or a

large or heavy load in stop-and-go traffic.

. When pulling a heavy trailer or a

large or heavy load in busy parking lots where improved low speed control of the vehicle is desired.

Operating the vehicle in Tow/Haul Mode when lightly loaded or with no trailer at all will not cause damage. However, there is no benefit to the selection of Tow/Haul when the vehicle is unloaded. Such a selection when unloaded may result in unpleasant engine and transmission driving characteristics and reduced fuel economy. Tow/ Haul is recommended only when pulling a heavy trailer or a large or heavy load.

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Conversions and Add-Ons

Add-On Electrical Equipment

{ Warning

The Data Link Connector (DLC) is used for vehicle service and Emission Inspection/Maintenance testing. See Malfunction Indicator Lamp (Check Engine Light) 0 100. A device connected to the DLC — such as an aftermarket fleet or driver-behavior tracking device — may interfere with vehicle systems. This could affect vehicle operation and cause a crash. Such devices may also access information stored in the vehicle’s systems.

Caution

Some electrical equipment can damage the vehicle or cause components to not work and would not be covered by the vehicle warranty. Always check with your dealer before adding electrical equipment.

Add-on equipment can drain the vehicle's 12-volt battery, even if the vehicle is not operating. The vehicle has an airbag system. Before attempting to add anything electrical to the vehicle, see Servicing the Airbag-Equipped Vehicle 0 63 and Adding Equipment to the Airbag-Equipped Vehicle 0 63.

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Vehicle Care

General Information

General Information . . . . . . . . . . 213
California Proposition

65 Warning . . . . . . . . . . . . . . . . . 213

California Perchlorate

Materials Requirements . . . . . 213

Accessories and

Modifications . . . . . . . . . . . . . . . . 213

Battery - North America . . . . . . 233
Rear Axle . . . . . . . . . . . . . . . . . . . . 234
Noise Control System . . . . . . . . 234
Starter Switch Check . . . . . . . . . 236
Automatic Transmission Shift

Lock Control Function Check . . . . . . . . . . . . . . . . . . . . . . . 236

Ignition Transmission Lock

Check . . . . . . . . . . . . . . . . . . . . . . . 236

Park Brake and P (Park)

Mechanism Check . . . . . . . . . . 237
Wiper Blade Replacement . . . . 237

Vehicle Checks Doing Your Own

Service Work . . . . . . . . . . . . . . . 214
Hood . . . . . . . . . . . . . . . . . . . . . . . . . 214
Engine Compartment

Overview . . . . . . . . . . . . . . . . . . . . 216
Engine Oil . . . . . . . . . . . . . . . . . . . . 217
Engine Oil Life System . . . . . . . 219
Automatic Transmission

Fluid . . . . . . . . . . . . . . . . . . . . . . . . 220
Engine Air Cleaner/Filter . . . . . . 223
Cooling System . . . . . . . . . . . . . . 224
Engine Coolant . . . . . . . . . . . . . . . 225
Engine Overheating . . . . . . . . . . 228
Engine Fan . . . . . . . . . . . . . . . . . . . 229
Power Steering Fluid . . . . . . . . . 230
Washer Fluid . . . . . . . . . . . . . . . . . 231
Brakes . . . . . . . . . . . . . . . . . . . . . . . 231
Brake Fluid . . . . . . . . . . . . . . . . . . . 232

Headlamp Aiming

Headlamp Aiming . . . . . . . . . . . . 238

Bulb Replacement

Bulb Replacement . . . . . . . . . . . . 238
Halogen Bulbs . . . . . . . . . . . . . . . . 238
Headlamps . . . . . . . . . . . . . . . . . . . 238
Front Turn Signal, Sidemarker,

and Parking Lamps . . . . . . . . . 240
Taillamps . . . . . . . . . . . . . . . . . . . . . 241
Center High-Mounted

Stoplamp (CHMSL) . . . . . . . . . 242
License Plate Lamp . . . . . . . . . . 242
Replacement Bulbs . . . . . . . . . . . 242

Electrical System

Electrical System Overload . . . 243
Fuses and Circuit Breakers . . . 244

Engine Compartment Fuse

Block . . . . . . . . . . . . . . . . . . . . . . . . 244
Floor Console Fuse Block . . . . 248

Wheels and Tires

Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 250
All-Season Tires . . . . . . . . . . . . . . 251
Winter Tires . . . . . . . . . . . . . . . . . . 251
All-Terrain Tires . . . . . . . . . . . . . . . 252
Tire Sidewall Labeling . . . . . . . . 252
Tire Designations . . . . . . . . . . . . . 254
Tire Terminology and

Definitions . . . . . . . . . . . . . . . . . . 255
Tire Pressure . . . . . . . . . . . . . . . . . 258
Tire Pressure Monitor

System . . . . . . . . . . . . . . . . . . . . . . 259

Tire Pressure Monitor

Operation . . . . . . . . . . . . . . . . . . . 260
Tire Inspection . . . . . . . . . . . . . . . . 263
Tire Rotation . . . . . . . . . . . . . . . . . 263
Dual Tire Rotation . . . . . . . . . . . . 264
When It Is Time for New

Tires . . . . . . . . . . . . . . . . . . . . . . . . 265
Buying New Tires . . . . . . . . . . . . . 266
Different Size Tires and

Wheels . . . . . . . . . . . . . . . . . . . . . . 267

Uniform Tire Quality

Grading . . . . . . . . . . . . . . . . . . . . . 268

Wheel Alignment and Tire

Balance . . . . . . . . . . . . . . . . . . . . . 269
Wheel Replacement . . . . . . . . . . 269

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General Information For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people. Genuine GM parts have one of these marks:

Tire Chains . . . . . . . . . . . . . . . . . . . 270
If a Tire Goes Flat . . . . . . . . . . . . 271
Tire Changing . . . . . . . . . . . . . . . . 272
Full-Size Spare Tire . . . . . . . . . . 280

Jump Starting

Jump Starting - North

America . . . . . . . . . . . . . . . . . . . . . 280

Towing the Vehicle

Towing the Vehicle . . . . . . . . . . . 283
Recreational Vehicle

Towing . . . . . . . . . . . . . . . . . . . . . . 284

Appearance Care

Exterior Care . . . . . . . . . . . . . . . . . 285
Interior Care . . . . . . . . . . . . . . . . . . 290
Floor Mats . . . . . . . . . . . . . . . . . . . . 293

California Proposition 65 Warning WARNING: Most motor vehicles, including this one, contain and/or emit chemicals known to the State of California to cause cancer and birth defects or other reproductive

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213

harm. Engine exhaust, many parts and systems, many fluids, and some component wear by-products contain and/or emit these chemicals. See Battery - North America 0 233
and Jump Starting - North America 0 280.

California Perchlorate Materials Requirements Certain types of automotive applications, such as airbag initiators, safety belt pretensioners, and lithium batteries contained in Remote Keyless Entry transmitters, may contain perchlorate materials. Special handling may be necessary. For additional information, see www.dtsc.ca.gov/hazardouswaste/ perchlorate.

Accessories and Modifications Adding non-dealer accessories or making modifications to the vehicle can affect vehicle performance and safety, including such things as

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airbags, braking, stability, ride and handling, emissions systems, aerodynamics, durability, and electronic systems like antilock brakes, traction control, and stability control. These accessories or modifications could even cause malfunction or damage not covered by the vehicle warranty. Damage to vehicle components resulting from modifications or the installation or use of non-GM certified parts, including control module or software modifications, is not covered under the terms of the vehicle warranty and may affect remaining warranty coverage for affected parts. GM Accessories are designed to complement and function with other systems on the vehicle. See your dealer to accessorize the vehicle using genuine GM Accessories installed by a dealer technician. Also, see Adding Equipment to the Airbag-Equipped Vehicle 0 63.

Vehicle Checks

Doing Your Own Service Work

{ Warning

It can be dangerous to work on your vehicle if you do not have the proper knowledge, service manual, tools, or parts. Always follow owner manual procedures and consult the service manual for your vehicle before doing any service work.

If doing some of your own service work, use the proper service manual. It tells you much more about how to service the vehicle than this manual can. To order the proper service manual, see Service Publications Ordering Information 0 319. This vehicle has an airbag system. Before attempting to do your own service work, see Servicing the Airbag-Equipped Vehicle 0 63.

Keep a record with all parts receipts and list the mileage and the date of any service work performed. See Maintenance Records 0 305.

Caution

Even small amounts of contamination can cause damage to vehicle systems. Do not allow contaminants to contact the fluids, reservoir caps, or dipsticks.

Hood To open the hood:

1. Pull the handle with this symbol

on it. It is in front of the driver side door frame near the floor.

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3. Lift the hood, release the hood prop from its retainer, and put the hood prop into the slot in the hood.

If the vehicle has an underhood lamp, it will automatically come on and stay on until the hood is closed. Before closing the hood, be sure all of the filler caps are on properly. Then lift the hood to relieve pressure on the hood prop. Remove the hood prop from the slot in the hood and return the prop to its retainer. Let the hood down and close it firmly.

2. Go to the front of the vehicle

and lift up the secondary hood release, which is underneath the middle of the hood.

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Engine Compartment Overview

6.0L V8 Engine Shown (4.8L V8 Engine Similar)

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1. Battery - North America 0 233. 2. Radiator Pressure Cap. See

Cooling System 0 224.

3. Coolant Recovery Tank. See

Cooling System 0 224.

4. Automatic Transmission Fluid

Dipstick. See “Checking the Fluid Level” under Automatic Transmission Fluid 0 220.

5. Engine Oil Fill Cap. See “When

to Add Engine Oil” under Engine Oil 0 217.

6. Engine Oil Dipstick. See

“Checking Engine Oil” under Engine Oil 0 217.

7. Engine Air Cleaner/Filter 0 223. 8. Power Steering Fluid

Reservoir. See Power Steering Fluid 0 230.

9. Brake Master Cylinder

Reservoir. See Brake Fluid 0 232.

10. Windshield Washer Fluid

Reservoir. See “Adding Washer Fluid” under Washer Fluid 0 231.

Engine Oil For diesel engine vehicles, see “Engine Oil” in the Duramax diesel supplement. To ensure proper engine performance and long life, careful attention must be paid to engine oil. Following these simple, but important steps will help protect your investment: . Always use engine oil approved to the proper specification and of the proper viscosity grade. See “Selecting the Right Engine Oil” in this section.

. Check the engine oil level regularly and maintain the proper oil level. See “Checking Engine Oil” and “When to Add Engine Oil” in this section.

. Change the engine oil at the

appropriate time. See Engine Oil Life System 0 219.

. Always dispose of engine oil

properly. See “What to Do with Used Oil” in this section.

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217

Checking Engine Oil It is a good idea to check the engine oil level at each fuel fill. In order to get an accurate reading, the vehicle must be on level ground. The engine oil dipstick handle is a loop. See Engine Compartment Overview 0 216 for the location of the engine oil dipstick. Obtaining an accurate oil level reading is essential: 1.

If the engine has been running recently, turn off the engine and allow several minutes for the oil to drain back into the oil pan. Checking the oil level too soon after engine shutoff will not provide an accurate oil level reading.

{ Warning

The engine oil dipstick handle may be hot; it could burn you. Use a towel or glove to touch the dipstick handle.

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Vehicle Care

2. Pull out the dipstick and wipe it

with a clean paper towel or cloth, then push it back in all the way. Remove it again, keeping the tip down, and check the level.

When to Add Engine Oil

If the oil is below the cross-hatched area at the tip of the dipstick, add 1 L (1 qt) of the recommended oil and then recheck the level. See “Selecting the Right Engine Oil” in this section for an explanation of what kind of oil to use. For engine oil crankcase capacity, see Capacities and Specifications 0 307.

Caution

Do not add too much oil. Oil levels above or below the acceptable operating range shown on the dipstick are harmful to the engine. If you find that you have an oil level above the operating range, i.e., the engine has so much oil that the oil level gets above the cross-hatched area that shows the proper operating range, the engine could be damaged. You should drain out the excess oil or limit driving of the vehicle and seek a service professional to remove the excess amount of oil.

See Engine Compartment Overview 0 216 for the location of the engine oil fill cap. Add enough oil to put the level somewhere in the proper operating range. Push the dipstick all the way back in when through.

Selecting the Right Engine Oil Selecting the right engine oil depends on both the proper oil specification and viscosity grade. See Recommended Fluids and Lubricants 0 303.

Specification Ask for and use engine oils that meet the dexos1™ specification. Engine oils that have been approved by GM as meeting the dexos1 specification are marked with the dexos1 approved logo. See www.gmdexos.com.

Caution

Failure to use the recommended engine oil can result in engine damage not covered by the

(Continued)

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Caution (Continued)

vehicle warranty. Check with your dealer or service provider on whether the oil is approved to the dexos1 specification.

Viscosity Grade Use SAE 5W-30 viscosity grade engine oil. Cold Temperature Operation: In an area of extreme cold, where the temperature falls below −29 °C (−20 °F), an SAE 0W-30 oil may be used. An oil of this viscosity grade will provide easier cold starting for the engine at extremely low temperatures. When selecting an oil of the appropriate viscosity grade, always select an oil of the correct specification. See “Specification” earlier in this section for more information.

Engine Oil Additives/Engine Oil Flushes Do not add anything to the oil. The recommended oils meeting the dexos1 specification are all that is needed for good performance and engine protection. Engine oil system flushes are not recommended and could cause engine damage not covered by the vehicle warranty. What to Do with Used Oil Used engine oil contains certain elements that can be unhealthy for your skin and could even cause cancer. Do not let used oil stay on your skin for very long. Clean your skin and nails with soap and water, or a good hand cleaner. Wash or properly dispose of clothing or rags containing used engine oil. See the manufacturer's warnings about the use and disposal of oil products. Used oil can be a threat to the environment. If you change your own oil, be sure to drain all the oil from the filter before disposal. Never dispose of oil by putting it in the

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219

trash or pouring it on the ground, into sewers, or into streams or bodies of water. Recycle it by taking it to a place that collects used oil.