Correct , Redline oils do not have the API donut on their bottles . Is that a bad thing ? I certainly don't think so and evidently Redline don't think it's such a bad idea to NOT beat to the drum of the API and ISLAC either while paying money for the donut to boot . Maybe they think they can build a better oil that way .
The API , ISLAC or both upped the average cam and lifter wear allowance of the GM dyno mule engine from 20 μm maximum for the SL 30wts to 60 μm maximum for the SM-GF-4 30wts .
Sequence IIIF
Sequence IIIG
But thats beside the point
What was the topic ?