Drew
"We would like you to know that while we are aware of Valvoline's assertions, ExxonMobil stands behind the quality of Mobil 1 and all of our lubes products. ExxonMobil's GF 4 licenses for all product lines are valid."
A final post from me on this subject, I have no idea what is in any of these oils, neither do all but possibly a few here...if even they do.
As far as anyone knows other than a Valvoline ad, M1 has the spec's they claim they do. It also is still FF in cars costing over $200,000 as well as some the fastest cars and by some of the most respected auto makers in the world.
Until that changes all else is speculation and B S.
If I learn of something to the contrary then I will reconsider.
BTW I have nearly 400 qt's of oil in my oil stash. Only 15 are M1. I have 30 qt's of PP, 20 qt's of GC, 30 qt's of Amsoil 0W-30, 40+ Havoline Synthetic, 45+ Synpower, 12 Lucas Synthetic, 10 Torco, 35 Mobil 5000, 6 cases of Chevron, 6 cases+ of TropArtic syn blend and about 50 misc QS, Shell, Havoline and Superflo conventional oil.