Quote:
Originally Posted by 7 skulls
https://www.widman.biz/English/Calcu...erational.html
Find the viscosity of your oil online, plug it into the calculator. Add in the max sustained oil temp you see and bang. If your cSt answer is less than 7.5 (see my previous post), you need a thicker oil. If your already running a HD 5w30, then you need an oil cooler.
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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.