Il be completely honest, i cant give you an honest answer on that. Il have to email Amsoil to find out. All i can honestly say is that i have, as well as many customers, used the euro oils without any issue even eith extended drain. You do make a very good point, but if you dont want the euro oils then use our regular stuff, you wont be dissappointed. Also read up on Amsoil P.i. its probably one of the best fuel system cleaners and highly regarded. Il find out the facts on the euro oils so i dont mislead you.

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Do your car and move up to Amsoil.