many manufacturers are trying to increase product line and profitability. one way is to require different specks for their oil. this trend has caught on like a wild fire. this requires you as a consumer to buy their product. not many oil companies race to compete with a limited market. i do know Amsoil has a European specific synthetic oil, produced solely to meet the European manufacturers specs. But then again Amsoil makes all kinds of application specific oils for marine, motorcycles, shock oils, hydraulic oils, compressor oils, allison transmission oils.