Originally Posted By Supercuda
Oils without an API cert, well you can believe their crap shoot info if you want. I always wonder why they won't certify.

They often aren't certified because they contain high levels of ZDDP. For example, the current API SN service rating only allows a maximum ZDDP content of 800 ppm. They do this because the phosphorus in ZDDP has been shown to harm catalytic converters. In any event, lacking an API certification doesn't always mean that the oil is of poor quality. twocents

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