http://www.amsoil.com/storefront/afl.aspx
Looks like Amsoil 5w-40 now meets VW 505.01. Yet now it only meets API CF when it used to meet API CI-4. What's up with that? Why is it an oil that's made to meet 505.01 can't also meet CI-4?
Looks like Amsoil 5w-40 now meets VW 505.01. Yet now it only meets API CF when it used to meet API CI-4. What's up with that? Why is it an oil that's made to meet 505.01 can't also meet CI-4?