Quote:
Originally Posted by ZforMe
Does it concern anyone that Royal Purple is not API certified? And that it's API Service is SL in lieu of SM? I'm starting to lean towards AMSOIL. Lucky for me I have 3750 miles to think about it.
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Holding my quart of Royal Purple. On the back it clearly has a "API Service SL" "Energy Conserving" SAE 5w-30 stamp on it.
on the bottom it says "Royal Purple Meets or exceeds API Service SL warrenty requirements for the gasoline engines. it also meets GM4718m Gasoline engine and oil performance and fuel economy specifications."
Im still seriously thinking about useing royal purple.