Quote:
Originally Posted by ZDan
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...
I'm running Redline 5w30 (3.7 HTHS) at 275F max oil temp at the track for ~15 minute stints, ~4 stints per track day, and change it out after 4-6 track days. Your calculator says 6.3 cSt at 135C(275F). So be it... If I was running much longer stints or endurance racing, I might run an oil cooler.
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damn you hit 275F?
I can't get it past 100C/212F with my engine sitting +4k rpm for 20 minutes runs