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.
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.