Quote:
Originally Posted by shiro
Built engines and forced induction engines could uses a thicker oil to keep the temps down.
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Actually, there are reports on this forum where thinner oil keeps temps down better than thicker oil in track conditions.
And there are also forced induction applications here running 0W-20. They're just using robust 20 grades like Amsoil Dominator 5W-20, Red Line 0W-20, and Motul 300V 0W-20.
Unfortunately, the numbers on the bottle (or even the brand) don't tell you much. Motul 300V 0W-20 is completely different from Motul 8100 0W-20. Likewise, Amsoil Dominator 5W-20 is completely different from Amsoil Signature 5W-20. Some robust xW-20 oils will give you similar oil pressure to some low High Temp High Shear xW-30 oils. And those xW-20's may do a better job of maintaining consistent oil pressure in extreme conditions over the oil change interval than the low HTHS 5W-30's.
-Dennis