Xdrive, non-xdrive vs. transfer case oil

[StartX5]

Reading thru forum by searching 'xdrive' keyword, i have learned that most people here say that all facelift (produced later in 2003 and from 2004-2006) have xdrive. And it's not true.
My 3.0i produced on August/2004. And it does not have xdrive (i have been told by dealer after providing them my X5 last 5 digits of VIN#). How do you define that your truck is xdrive or non-xdrive?

Thanks.

P.S. i just changed the transfer case fluid at 74.5K miles and i could say this: 'life time' oil must be a joke. I drained the old TC oil and it's very very dark and it's only about less than.5 liter comparing to the new Dex III ATF oil that i bought from dealer last night. They recommended me to refill ~1.0 liter (1 quart)