Jeff: you area obsolutely right! My X5 has xdrive! Since i already refilled the Dex III ATF as dealer services suggested, i was double about my xdrive system in my X5. Like you said, i looked under my truck and it's xdrive transfer box. I took the picture and bring it to dealer where i got advisory from them. After they saw my transfer case photo, they said they made a big mistake and i told them that the Dex III ATF quart that suggested i already refilled for my TC box. And I also told them that because i double about it that's why i don't drive my X5 here instead of taking photo.
Finally they gave me free expensive ATC 500 transfer case oil! yay.
They said that the catalog problem and it shows my X5 is not xdrive.

Jeff, again, thanks so much for your help. I have learned a big thing from you.

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BMW X5 2004 - 2005 MB E320
BMW 1999 528i/ 1998 Nissan PathFinder (sold)