See the screen shots in Post 23 here: Xdrive or not?

05 should be x-drive. Mine is.


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x-drive. Takes BMW unicorn juice only. ECS tuning sells it. 1-liter is enough.

Thanks for all the responses.
The interwebs can be a double-edged sword: Using RealOem was pulling up Dexron III part 83229407858 incorrectly. Since this is a BMW X5 e53 XDrive, as you all mentioned, the correct part for transfer case fluid is 83220397244. Ordered a liter and kit from ECS. Documenting in detail so this may help others if they search, as I did.
Thanks again.

Guys, out of interest, what is the part number for the 2 new copper sealing rings?

07119963308

Cheers.

5 year update!

Almost exactly five years and 80,000 miles later I have had no trouble with my Xdrive transfer case since I wrote the original DIY. I never bothered to reset the adaptation values so I think I've proved you can safely skip that step if you prefer. I now have 170,000 miles on my 2004 E53 X5 3.0 and it is still going strong. I just ordered one liter of Xdrive fluid and I will be doing my second fluid change within a couple of weeks. I will take a shot of the old fluid again and post for all to see.

Great to hear!

Just changed mine and the tranny right away has a bit more kick to. haflf Mobil1 Synth 75w90 half Mobil1 Synth ATF. It took less than a Quart.