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Originally Posted by gtengr
I don't think anyone is concerned about the oil itself at those temps. The concern is about the pressure drop in the oil system and the influence on the bearing clearances.
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Which is why you should consider running higher viscosity oil at higher temps. I run 5w30 at the track to bump oil pressure up closer to "normal".
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I assume the recommendations in the factory manual exclude road course driving/extended high RPM use.
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I wouldn't assume that, extended high-rpm use is probably the only way the engine would ever see temps up to 279F... I don't know precisely what their temperature ranges mean, but I would guess that "normal" means that the computers don't have to dial back much if anything to try to keep oil temperature down, "warm" probably means they start dialing back, and "hot" probably means limp-home mode. My guesses anyway...
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I don't think you'll find many seasoned road course drivers who would consider 279-295 F oil to be just "warm."
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I don't think you'll find many seasoned road course drivers who have much if any real knowledge regarding correlation between oil temperatures and engine reliability/longevity, and what a *real* safe max oil temperature is. Whereas a large manufacturer that sells and warrantees millions of cars/engines per year probably has a pretty good handle on that.