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ZDan · 04-07-2022, 08:32 AM

Akshually...
At 270F operating temps, HTHS at 150C is probably more relevant than rated viscosity, as HTHS is at 150C/302F while rated viscosity is at 100C/212F. Here's another chart I grabbed from quick interwebz search, which I have no proof of, to be taken with grain of salt of course:

source: https://www.q8oils.com/automotive/low-hths-oils/

I've seen 3.5 HTHS as a general minimum recommendation for track usage at high oil temps. Some say 3.0 is fine, which chart above appears to corroborate. Most 0w20 synthetics are 2.5 - 2.9. *IF* I were to run 0w20 at the track, I'd try to get one with HTHS at the higher end of that range...
30-weights start at 3.0 HTHS, Redline 5w30 I've been running is 3.7.

04-07-2022, 08:32 AM	#57
ZDan Senior Member Join Date: May 2011 Drives: '23 BRZ Location: Providence, RI Posts: 4,672 Thanks: 1,439 Thanked 4,012 Times in 2,098 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	Akshually... At 270F operating temps, HTHS at 150C is probably more relevant than rated viscosity, as HTHS is at 150C/302F while rated viscosity is at 100C/212F. Here's another chart I grabbed from quick interwebz search, which I have no proof of, to be taken with grain of salt of course: source: https://www.q8oils.com/automotive/low-hths-oils/ I've seen 3.5 HTHS as a general minimum recommendation for track usage at high oil temps. Some say 3.0 is fine, which chart above appears to corroborate. Most 0w20 synthetics are 2.5 - 2.9. IF I were to run 0w20 at the track, I'd try to get one with HTHS at the higher end of that range... 30-weights start at 3.0 HTHS, Redline 5w30 I've been running is 3.7.