"protect"?

What a strange (yet common) term about oils... it's root is in the fear that oil marketers like to play upon...

Just like you use the correct tool for a particular job, you select the oil for the application. You don't just go to bigger wrenches for more protection.

Do you have a warranty on that car? If yes, use ONLY the oil BMW specs.

There are tens of thousands of posts on "What oil should I use in my BMW?" I'll leave it at that.

A

Edit: We still don't know the motor he is asking about....