I really don't get the endless threads about oil.
Why both taking a chance with Rotella, Royal Purple, whatever, when all you have to do is stick with factory recommended type, weights and brands. Seems pretty simple to me,
Why chance going cheap on an oil change on a multi thousand dollar engine.
Arguably, BMW engineers have done some goofy things over the years, but really, if they recommend a type, weight etc, they are far more knowledgeable that I (or most here) regarding what they have built.
any way...for what its worth...