My front differential took about 3/4 quart and rear ~1.4 quart - I refilled the same amount of oil that i drained out. Front diff oil look darker and than the rear.
Transfer case oil was completed dark when i drained it out and it should be refilled after 60K. Since i saw the transfer case oil that dirty, I am going to do the transmission oil change soon too, but this should be done by dealer.

Hey artman, how's your steering tic tok issue? Mine was resolved after replacing another steering rack. Replacement steering rack is anther major problem and it took me up to 4 hours to finish this job.

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BMW X5 2004 - 2005 MB E320
BMW 1999 528i/ 1998 Nissan PathFinder (sold)