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Originally Posted by RT-BRZ
I don't disagree at all. These same teams also run their cars for much longer periods of time and at much higher average RPM as well. The point is that they don't just expect to run thicker oil to compensate for those conditions.
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The point is that they don't mind running 280F sump, 355F max oil temps for hours on end at 9000+ rpm. While reportedly running 0w20...
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So, the answer to the basic question of thicker oil versus a cooler seems relatively straightforward. An oil cooler is the better way to address the issue.
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I have a different conclusion: 275F indicated, ~255F sump oil temps are likely not a problem even for good synth 0w20, but I run 5w30 with high HTHS (3.5) anyway. IMO there is no issue here to begin with.