Amsoil SS does not have the most recent API rating.
Originally Posted by JustN89
Not that this video proves anything, but why should "grade" matter. According to many on this site, all you need is the most recent API rating and after that, all oils will perform/protect the same. To those same people, the only advantage the Amsoil SS would provide over the vanilla M1 is OCI length which is irrelevant in these "tests".
Originally Posted by Triple_Se7en
Why is this test done using the lowest grade Mobil-1 against the top grade Amsoil? Kinda' slanted, don't you think?