I would agree with the above posts unless you're mechanically inclined. Let's say you are, then you have incredible resources at your disposal with the various BMW forums, this one being the best I've found..

If not, the first thing you should do is find a good, reputable independent tech shop, as close to you as possible. Take them coffee and donuts, and then pay them to do an inspection on your new ride. Whatever they tell you is wrong, no biggie, just come back on this board, and DO A SEARCH, before you post your questions/problems.

But, you should know, you bought a vehicle that needs an above average (understatement) amount of maintenance and attention. But it's a trade off for a vehicle that's head and shoulders above a Highlander, or Durango or any other mainstream SUV..