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Originally Posted by Perfectlap
I hear there are issues with Royal Purple "shearing".
Flamesuit on...
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I have no intent of flaming anyone, just increasing all of our collective knowledge. Just did a quick search concerning HTHS ratings, if your oil has an ACEA rating of A3, it should have a HTHS rating of 3.5 or greater. This is, I believe Porsche's requirement.
