Ok figureed it out - this chassis came with different diff options. Caught me off guard cause every other e83 I've seen had the diff with the 2 plugs. (see image). Ended up siphoning and filling via same hole.
Finished the diff only to find 2 engine mount (aluminum) bolts had sheared off. What an ordeal trying to get them out - replaced with steel bolts. BMW really should be forced to recall all these - it's like every second car now with 100K+ and aluminum engine mount bolts (3 per side) I find one or two sheared - if you've never inspected them time to.
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