Tom, Valvoline Zerex 5/150 is the BASF (Germany)Glysantin G34 formula. It is identical to Dexcool in all respects. It meets GM spec GM6277 (Dexcool type coolant). Of course, its pH will be different from Zerex G-05. Valvoline produces the G-05 coolant used by ... Login to read more.