Quote:
Originally Posted by viscositosis.rex
1. Sustina 0W20. HTHS 2.6 Maverick has tracked with it. I have used it for 20k OCI street use.
2. Red Line 0W20. HTHS 2.9
3.Ravenol 0W20 DFE. HTHS 2.7
4. Motul Specific VW 508.00/509.00 --Porsche C20 0W20. HTHS 2.5
5.Royal Purple 5W20 HPS w/Synerlec. HTHS 2.7
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Can you elaborate the importance if the HTHS you've listed in high RPM engines compared to the information on this site?
https://expert.q8oils.com/automotive/low-hths-oils/
It honestly sounds like the engine's engineered intended specs pairing with the correct HTHS is more important that whatever the oils are rated at.
"A lubricant with high HTHS viscosity offers better protection for engine parts. The engine type: Low HTHS oil in an engine designed for high HTHS oil can cause damage."
From what I can find, one of the criteria to be a (any)w-20 oil is to have a minimum of 2.6 HTHS.
Seeing as how our engine is rated for 0W20 or 5W30 (or 0W40 if you're hardcore track), it looks like our engine has an intended HTHS rating of 2.6 ~ <3.7.