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My van's motor lets me overfill it by a quart with no ill effects. It seems to like it, as far as that goes. And as far as whether less oil will allow the engine to heat up faster, there's plenty of heat to go around.
I'd be more comfortable with a lower weight of oil, or as i do, add a quart of Marvel mystery Oil to the crankcase to help keep things clean in there. It likely lowers the viscosity somewhat as well.
I've also loved to second guess the design specs of a vehicle, and sometimes i have to realize much smarter people than I said "you need 5 quarts of this oil to make the engine last longer."
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 RIP Maxima 1997-2012
Quote:
Originally Posted by jamesqf
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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