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like the only argument against lowestWwhateverthefactoryrecomends is people with old engines who say they leak when they put in a modern 0w30 or 0w40 when back in the day they only used to be able to make 10w30 or 10w40.
0w40 is thinner on start up, and the proper thickness when warm, thus less engine wear all round than 10w40. back when the engine was built, 0w40 was probably not a thing that oil companies could make, thus why they didnt specify it or built for it. but it will reduce engine wear.
would you rather fix a couple of leaky 50 cent gaskets, or have to have your engine rebuilt sooner?
like its a no brainer.
and its certianly not a smart idea to put thicker than factory recommended oil in a modern engine. piston gaps and bearing gaps etc, all have gotten hugely better even in the last 20 years, it would be foolish to put in thicker than specified oil to seal those gaps and lubricate those parts. like why design the engine to have those gaps, only to put in a thicker oil, designed for larger gaps, into it?
like this is not that complicated.
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