X5 4.8 is transfer case fluid replacement
 

The fluid that came out was black and very dirty. From a golden brown to black. Very happy I replace the fluid. http://tapatalk.imageshack.com/v2/14...4eb21270ef.jpg

Reset the x-drive adaptations. It'll run smoother and your clutch packs will wear less since it'll know that you have fresh fluid in it.

How is this done

Do you notice any improvements afterward? Going to do mind next week!

I did it via DIS diagnostics software. Post#43 has some info http://www.xoutpost.com/bmw-sav-foru...uid-diy-5.html

In my case the fluid change fixed a loud whining noise from the transfer case. Indy and dealership were recommending transfer case replacement.

of course they are... find a transmission shop in your area that rebuilds atc transfer cases and have your local mechanic remove it and send it there to have it rebuilt. My only makes a whurring or whining noise when it's cold. I suspect it's the guibo's in my case.

going that route will save you some $$$

What was the mileage?