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Originally Posted by ADewan
the 30W oil is thicker than 20W oil.
Hence the film of oil is thicker
Thus, the drag is more but, the thicker layer can accomodate higher sheer stresses due to the High Revving nature of the engine.
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But why would it work better? What are the benefits? How does it work with the tolerances set by the engineers?
5W-30W is thicker than 5W-20W is a fact, but why put it in an engine not designed for it.