Courtshark

YMMV, but my local Advance Auto has 5 quarts of Mobil 1 15w-50 for $33 including an M1 filter. Mobil does not make a filter for a 928, as far as I can tell, so I just got filters for my other cars. They also included 0w-40 in the sale (good for the 9-5 Aero). While M1 often goes on sale, it doesn't usually include the 0w and 15w... and thus the post.