When Fram went from recommending the Ultra for 15K to 20K did anything inside the filter change?....or did they just realize that it could go further?
It seems Mobil 1 oil filters went to a 20K recommendation when they introduced Mobil 1 Annual Protection without changing anything about the filter....
It seems Mobil 1 oil filters went to a 20K recommendation when they introduced Mobil 1 Annual Protection without changing anything about the filter....