Mobil has some group 2 and group 3. With 51% group 3 it can be called a group 3. It needs at least 10 and a half percent synthetic to be called a synthetic blend. ( about 15% pao in mobil ) I have spoken with chemists at mobil many times. They Have told me many of the additives are in the oil only for classifacation purposes. IT IS THAT GOOD.