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? — Ralph Probably. I ...
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 ...
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