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Originally Posted by x808drifter
That wasn't meant at you directly. More for those in here that have said you need to run a certain weight. (although it does look that way)
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I recommend running 30 (or 40) weight, for sure. But I have run at a couple of track events with 0w20 myself...
Quote:
And again nobody is arguing that oil gets thin at hot temps.
I just asked for proof for some of your comments like
"Running 30- or 40-weight at 270F is going to get you closer to what the viscosity of the factory-fill 0w20 is at normal street oil temps."
Where did you get this info from?
That is all I am asking. My Google-Fu is failing me when it comes to finding actual tests for this stuff.
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I don't get your confusion here. It would seem pretty obvious that a 30-weight oil, which is required to be quite a bit thicker than 20-weight at the reference temp of 100C/212F, is likely to still be thicker at 270F as well. In general. You *might* be able to find some 0w20 oil at the thicker end that is as thick at 270F as the lightest-actual-weight 30-weight synth. But if you compared same make/model of oil in 0w20 vs. 5w30 synth, I don't think you'd ever find the 20-weight to be as thick at 270F as the 30-weight...
If you want *proof* of higher effective viscosity of 30- or 40-weight vs. 20-weight at higher temperatures, go by HTHS (high temperature high shear) which is at 150C/302F. As I posted above ^^^ this is really a better metric for our purposes.