BTW, i called Valvoline today and along with all their oils, all NAPA oils are SN Plus as well. Their bottles still don't show i though.
Originally Posted by wemay
Valvoline, Havoline and Castrol are, off the top of my head. But remember, that Infineum study suggests little correlation between LSPI and the presence of Calcium, which in turn is how these oils met API SN Plus...by reducing that additive and Increasing Magnesium. It goes on to say that base oil is the best determinant. Hence Conventional being more resistant.
Originally Posted by Triple_Se7en
What conventionals are SN+? Not Pennzoil conventional 5w30.