Originally Posted By: 901Memphis
Amsoil signature series is probably even better than Mobil 1, buy you get Mobil 1 for less than $5 a quart which makes it a huge value.
901Memphis i will agree. The reason is that the OP didn't specify based on price, and i think it is safe to say that SS probably would clean better than M1 given and equal OCI.
Here me out guys. Im a M1 fan, But based on the shear amount of additives in each oil it would seem that Amsoil SS would likely have the upper hand with its massive amounts of calcium (3,800 ppm) and lots of boron (200+ppm).
Would this translate into better cleaning over M1 EP in the real world? Im not 100% sure but i would venture to say given and equal 10k mile interval probably so.
The massive downside is Amsoil SS cost twice as much, but more than likely will not give twice the cleaning power or allow twice the actual oil change interval of M1 EP.
It's anyones guess, but can we honestly say we have ever seen a dirty engine that was ran on Amsoil, M1, or any synthetic at a reasonable interval? I sure haven't seen any i would consider dirty...dirty.