I seem to recall that Dextron III is only for pre-XDrive transfer cases...
I believe that XDrive models require a slightly different fluid.

Dlrs have it as PN BMW transfer case oil - TF 0870, and from perusing,
I don't think there is a substitute.
GL,mD

__________________
Ol'UncleMotor
From the Home Base of Pro Bono Punditry
and 50 Cent Opins...

Our Mtn Scenes, Car Pics, and Road Trip Pics on Flickr:
http://www.flickr.com/photos/4527537...7627297418250/
http://www.flickr.com/photos/4527537...7627332480833/

http://www.flickr.com/photos/45275375@N00/

My X Page