The stuff is peculiar to BMW and as they consider the diff to be "sealed for life" they don't even sell the stuff by the bottle officially, they do keep it in stock in large drums, so, if you take an empty 1 litre gear oil bottle (or similar) down to your local BMW service centre, they will sell it to you at the cost that they would charge if they needed to change it on a repair job.
If I remember correctly it is about £20/litre.
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