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There's only a fill hole, so the oil must be sucked-out via that hole. Then you can put fresh fluid in until it starts to flow out of the hole.
I watched the mechanic do this with my car the last time it was done. Believe it or not, he spent 20 minutes sucking-out the used fluid. Basically, once he'd gotten most of the fluid out, he then moved the tube he was using to get the fluid out around in a variety of ways to try and get the rest of it out. And he did get a fair amount more used fluid out of the diff using this method. He certainly had more patience than I would have had if I'd been doing it.
I wonder why there's no drain plug on our diffs.
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2017 M240i: 23.8K, 28.9 mpg, MT, Sunroof Delete, 3,432#, EB, Leather, Driving Assistance Package, Heated Front Seats | Sold: E12 530i, E24 M635CSi, E39 520i, E30 325is, E36 M3 (2)
TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro;
GTechniq Crystal Serum Ultra Ceramic; Suntek PPF
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