I find it odd that GM's flagships with the Alpha platform and Corvette with their DI V8s LT1, LT2 call for Mobil 1 0w40 ESP, now transitioning to Dexos R. It is interesting to see the Dexos validation evolve.
The Mobil 1 site might be broken or they are looking at making Mobil 1 ESP x3 0w40 a...