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I would stay away from those 0w oils unless the manufacture calls for them in that type of engine.
Problem I see is you dont want to use super thin oil in a compact and some what high power 4 cylinder engine that my have high bearing loads on its crank rod bearings.
If you build your own gasoline engine and everything just so happened to have tight .002" crank, rod and cam bearing clearances, also had fairly large bearing surfaces compared to power out put then 0w might be the way to go.
Last engine I built everything was closer to .004'' and 5w-40 seems like it may be too thin.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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