It's especially funny because this car is notorious for BMW's insistence that their own-branded 10W-60 is the only suitable engine oil. Again, that's one single solitary oil – not a published spec that anyone could formulate to. Not even an exclusive OE-specific spec, as BMW does with its other cars. It's BMW's own 10W-60 or bust.
Better situation for the manual trans but not by much. BMW has had two specific different fluid recommendations (MTF-LT-2 and then MTF-LT-3), both BMW-branded.
I had thought the spec for the diff was just a 75W-140 GL-5 with friction modifier for the limited-slip unit. Evidently Mobil disagrees. Again, BMW calls for one specific fluid (Castrol SAF-XJ and its successors).
#ShrugLife
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