Well, if it's not Delvac 1 it sure is a close approximation. If you look at VOAs of all other grades of Mobil 1, the add packs look remarkably similar: Zinc, phos, moly, boron, calcium, and a touch of magnesium. If you look at Mobil 1 SUV you see a butt-load of magnesium, calcium, zinc, and phos. No moly. No boron. If you look at Delvac 1 you see the same thing.
My conclusion: If Mobil 1 SUV isn't Delvac 1, it's certainly not just a 5w40 version of Mobil 1 SuperSyn either.