quote:Isn't the ACEA C3 spec similar to API SM, both specs being low SAPS? VW claims backwards compatibility of VW 504/507 in even ACEA A3/B4 applications. Cam someone elaborate on the wear limits allowed by API SM? - average cam plus lifter wear: max 60 microns - cam wear average: max 90 microns - bearing weight loss: max 26 mg
Most engines that spec SM/GF-4 oils aren't as finicky as those VW/Audi engines.