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Originally Posted by KillerBMotorsport
That might be true for some fixed viscosity base fluids, but with a modern synthetic multi-grade it isn't.
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The best modern synthetic multi-grades still have viscosity decreasing with temperature, which is perfectly normal. At 275F, 0w20 is going to be a LOT thinner than it is at 220F.
At 220F, 0w20 is ~7.5 cSt. At 275F, it's below 5 cSt.
Running a 40-weight oil you'll be back at close to 7.5 cSt at 275F. I've been running 5w30 in track season, may move to 5w40 this year...
If running for decent amount of time at higher temps, probably a good idea to run something thicker than 0w20... But 10w50 may be overkill!
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I see far more oil coolers installed on cars 'because racecar', few know what their oil temps are, and even fewer knew what they even were before installing it. If you really want to be 'because racecar', you only add complexity (DNF potential), weight, and costs, when it's necessary AND going to payback in measured performance and/or reliability improvements.
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100% agree!