Quote:
Originally Posted by MeteorGray
My Mazda specs 0w20. I wonder how thin they're going to get? Is there any -20w-00 out there? Maybe when the new Ice Age hits.
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I know that there are 5W and 0W racing oils out there. As for standard oils, some cars now use 0W16 oil. I wonder how much the oil viscosity actually affects efficiency within reason.
Realistically the fuel efficiency difference between, say, 5w20 and 5w30 oil is probably under 1 percent from the research I did, under most conditions anyways.