BTW, I run full synth 15w50 in my 13:1 comp 12,000rpm dirtbike, and I can't tell the difference between 15w50 and 10w40, besides the 15w50 seems to last longer.
I can't either.But i wouldn't take the chance for no apparent gain in using a 50 grade over a 30 or 40 grade.
Originally Posted by Type R Positive
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