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[QUOTE=ZDan;3476240]I think HTHS is more important than extrapolated viscosity for high rpm/high temperature operation at the track. IMO run oil with HTHS >=3.5 cP @150C and yer good up to pretty high oil temps...
Can't argue with that either. HTHS 3.5 or more for the Castrol I run so I'm happy. Kinimatic viscosity calculations mimic well what i saw with 5w30 and with 0w20. Hated watching oil pressure drop off with the 0w20 at temps matched by the numbers. If I push the 5w30, I should see the same drop off somewhere north of 118C. No race tracks around here unfortunately.
I determined a while ago that the risks associated with a cooler weren't worth it for my usage and the numbers say I don't need one. Interested in your UOAs and oil pressures. Not being a smart ass. Really glad someone is out there running this car hard without a cooler.
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