I'm sure all longlife specs are only applicable to vehicles that have been prepared for extended drain (improved oil flow, cams with reduced friction, flexible oil life monitor, etc). Just because an oil has longlife approval doesn't mean it's superior for engines that are not properly equipped. Most (not all) of the longlife-approved oils have a lowered HTHS. Longlife oils must hold up longer than regular oil, but I don't think they are better per se.
M1 0W-40 meets BMW LL-01, Daimler Chrysler 229.3/229.5, and Opel Long Life Service Fill GM-LL-A-025.
Once again, M1 0W-40 shows to be an allround talent.
[ August 21, 2003, 11:24 PM: Message edited by: moribundman ]