Originally Posted By: oil_film_movies
Full SAPs. This is important to know for diesels and U.S. gasoline (high sulphur) applications.
FS 0W40 and FS X2 5W50 are both 1.34% SAPS according to XOM's website.
15W50 is 1.21% and doesn't get the FS.
The rest of the base M1 line are 0.80-.85% SAPS.
I think this makes sense, just wonder about the 15W50...maybe it is just shy of being considered full SAPS?