is this product for you? shell helix ultra ect c3 5w30 is a premium, fully synthetic formulation suitable for the latest petrol and diesel engines, including those fitted with a diesel particulate filters (dpf). shell helix ultra ect also features unsurpassed sludge protection no other motor oil can keep your engine closer to factory clean & its low viscosity, low friction formulation can achieve up to 1.7% fuel economy gain. meets vehicle manufacturers extended service specifications & has ...