The latest Amsoil price catalog has 4-Ball wear results for GC. Amsoil 0w-30 = .36 PP 5w-30 = .542 QS 5w-30 = .55 M1 EP 5w-30 = .619 GC 0w-30 = .634 Havoline 5w-30 = 1.646 LOL It's been said this test relates to valvetrain wear. Have you ever seen GC show excessive valvetrain wear? I havn't. Goes to show how bogus this 4-ball wear test is in relation to actual engine wear. The Havoline results are funny, especially when you consider how good that oil is.