When choosing between two different types of motor oil for your car, it is helpful to understand these oil classifications. They conform to the Society of Automotive Engineers multigrading system, ...

My Audi requires 5W-40 oil. I use Mobil 1, full synthetic. I have some 0W-40 left over from a previous vehicle. If I mix equal parts of 0W-40 and 10W-40, will that make 5W-40? Probably. I don’t have a ...

Continue reading "How Super are synthetics?" But now 5W-40 oil is being widely touted to fleets as a viable option along with other lower-vis multi-grade oils — chiefly 10W-30 and 10W-40 — for ...

CALGARY, Alta. — Shell Canada has launched a new Rotella T Synthetic 5W-40 heavy-duty engine oil, which the company says offers improvements in wear protection, soot control, deposit control and heat ...