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sMASH wrote:the viscosity of the oil is resistance to movement. so always use the thinnest oil u can use that doesnt cause too much blow by, too much wear, and too much heat. the only time u want to increase the body of an oil, is if ur rings dont seal as good. not bad enough to do a ring job, but not good enough that its unnoticed. that way, the viscosity of the extra body assists the rings.
if u run a car hard with higher body oil, u can potentially wear down ur rings prematurely.
i running 10w30 in a hr16, so stick to that. the only time i will step up the body is if i getting extra back pressure or burning more oil than normal. usually, the only time i have to top up oil is around the time to change any ways. that good enough for me.
mind u, the ga15 and the sr20 never had to top up. both of those were 20w50, and up to the last i try a 15w30 in the sr and i find it was nicer. never got to use it enough to get a good observation of the performance.
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