It's really drastic how these specs compare, between M1 EP and M1 MC oils. $6qt vs $9qt. Mobil 1 MC 10W-40 20W-50 Flash Points(F) (487) (518) HT/HS 4.15 5.94 Mobil 1 Car 10w-40 15w-50 (443) (465) 3.9 4.4 (?) From Amsoil's webpage
quote:MC oils are using the same levels of Moly and Boron (275ppm) but 1,800/1,900ppm of ZDP So if the MC oils are then friction modified, could they be used in a high HP car such as a Z06? [ April 28, 2005, 06:19 PM: Message edited by: buster ]
Robust Additive Levels Recent automotive motor oil regulations have limited certain additive levels, including the anti-wear additive known as ZDDP. ZDDP is an extremely effective anti-wear, anti-oxidant additive, and reducing its level results in compromised wear control and shortened service life. Because motorcycle applications require robust additive systems to control wear and oxidation, use of an automotive motor oil or an automotive motor oil re-labeled as a motorcycle oil compromises protection and performance. AMSOIL Synthetic Motorcycle Oils are overtreated with robust additive packages, including high levels of calcium, phosphorus, zinc and additional oxidation inhibitors, to extend oil life expectancy, provide unmatched engine cleanliness and greatly reduce wear.