Just because Exxon-Mobil supplies it, it doesn't mean it's the same thing as Mobil 1.Read the back of the bottleon top of that I know people who transport it.
While the base stock on TGMO is really unknown, it's been speculated that it's a Group III, possibly a GTL basestock blend. Then the additive package is a lot different. TGMO, based on the VOA's posted on this site, is very heavy on the Moly and Boron. The Mobil 1 EP and especially AFE don't get to that level.