Originally Posted by guscavalieri

Ok, my 2 cents here...
Last week I replaced my TC oil and was dark, not black (Oh, sorry!... 2007 X5 4.8i 96K), and today just did the rear differential and it was colored as mud... ughh!!!.. for next week will be my transmission oil.... I never trusted my SA when he said that BMW fluids were lifetime... No way...! overall my X5 feels smoother than before, after next week I need to take the X5 to the dealer to reset the adaptations for transfer case and transmission...