Quote:
Originally Posted by bfrank1972
Yup modern synthetic oils can live well into the 300's with no problems at all. I think the issue is specific to the overall design of the oiling systems, if the motors are able to maintain pressure at higher temps, if the motors have tolerances that allow heavier weight oils, etc. FA20's may have problems running in the upper 200's due to oil pressure limitations + thinner oil requirements, but other motors (factory motors) run in that range as normal. Just part of the larger engineering picture.
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Let's dispel one thing. The engine does not have a, "thinner oil requirement." The EPA mandated fuel economy numbers do.