YOu might as well, or you might be spending your hard earned cash on a new transfer case, and you KNOW how $$ that is.... They have all the appropriate fluids. You can look them up on bavauto.com
'86 325es (TURTL3): PJ peetsa hawler
'87 535is (BADWATER): almost done... really.
'86 325e (GRN HLL): DD/show/rocket
'04 x3 3.0i: Wife's Bimmer (manual, woot!) My BMW Blog