Maybe the oil sold in Europe is more uniformly higher grade?
If I go to the local auto parts store here, I can spend ~$1.00/qt for oil or more than $10.00/qt for oil. Guess which oil most people will buy?
Also I don't really have any confidence that the dealers are using factory specified oil. I think they probably use the cheapest bulk oil they can buy. That's why I change my own oil, that way I know what is in the engine.
If I go to the local auto parts store here, I can spend ~$1.00/qt for oil or more than $10.00/qt for oil. Guess which oil most people will buy?
Also I don't really have any confidence that the dealers are using factory specified oil. I think they probably use the cheapest bulk oil they can buy. That's why I change my own oil, that way I know what is in the engine.