0w-40 / 5w-40 Qualifies for 10w-40?


Staff member
Oakville, Ontario
It is true, because if an oil passes the 0w cold cranking tests, then it obviously has numbers good enough to pass the 5w and 10w cold cranking tests too. So legally a company could have a 0w40 oil on their hands and repackage it as both a 5w40 and a 10w40 and a 15w40 if they wish. It's been pointed out on here before that Schaeffer's 15w40 could actually be labelled a 10w40 if they wish, since it's cold cranking numbers are good enough. But 15w40 is a more popular viscosity to the types of clients they typically deal with.