quote:Who knows? Is a 4 ball wear test relevant to how an oil performs in an engine? We could use a grease instead which would provide excellent 4 ball wear test results but I doubt anybody wants to put 4 quarts of grease into his engine.
Originally posted by buster: Amsoil's latest catalog shows Mobil 1 5w-30 wear scar at .5 or .6 and change, while the 0w-30 is 1.6 something. Why would there be such a difference?