So I've got a 660hp C63s, dudes in my car club have GTRs, Supras, 900hp M5s etc, and we all pretty much use the same group of 40w and 50w oils. All the cars get tracked. No oil caused failures at all.....even running oil temps at 270-290.......we all laugh because we basically try different oils for no reason. I think we switch because we get bored....honestly we all could run on Redline 5w40 and be fine!
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