I think it's funny how ExxonMobil is spinning M1EP as a 15,000 mile oil and M1AP as a 1 year oil. If you look at the specs though, it's:
M1EP 1 year, 15,000 miles, $25 for a 5 quart jug.
M1AP 1 year, 20,000 miles, $50 for a 5 quart jug.
Now, if ExxonMobil would tell us what goes in to their...