C'mon guys...

G11 has the same BASF additives as Zerex G05

G12 and G12+ are the same as Peak Global (OAT with no 2-eah)

Havent figured out G12+ Plus, but it is also a BASF additive.

Now, that said, these engines are either iron block/aluminum head, or all aluminum. There is NOTHING special about them. You can mix OAT with OAT, HOAT with HOAT, or even anything in between. Even crappy old Silicate Green can go in there, though I wouldnt do that unless its an emergency.