Quote:
Originally Posted by Goingnowherefast
But again, it's not the oil breaking down that's the danger here. It's the worry that the viscosity of the oil drops low enough that it's unable to provide adequate lubrication to the bearings. I'd recommend sending your oil out to Blackstone for analysis if you plan on not running and oil cooler.
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You pick oil viscosity based on operating temps. At 275F, I think 30-weight is fine, at least for limited track usage. If I was track-only, I might go 40-weight. Probably HTHS more relevant anyway, 5w30 Redline is 3.7 HTHS.
I haven't sent oil out for analysis because I've seen reports of others who have. After typical HPDE-type track usage, "high" oil temps, with no oil cooler, the reports I've seen show little to no degradation of the oil, and normal amounts of wear metals.