I would change the oil if you want to keep you x5 for a long time. I plan to change my tranny this year and I only have 48,000 on my x5. I change the tranny oil on my mercedes ml at about the same milage. Of course if you know the story about mercedes is that at first they say you don't need a tranny oil change then they said you need one (maybe they found problems). Regardless there is metal flakes in you tranny right now (either on the magnet if there are any or in you tranny filter) unless the tranny oil had been changed already.

But JCL is right on the money. I would make sure you use the exact tranny oil. I would not use the so call "equilvent" unless it was shown to me that they are the exact oil. Otherwise I would pay the $8 or $10 per quart at the dealer.

The other things is that you want to make sure they put the right amount of tranny oil in your x5. The x5 is very hard to check the tranny oil. All tranny oil level must be check with the engin running at the right temperature. The X5 is extra hard because it does not have a dip stick. So you have to be under the x5 with the engin running at the right temperature to check the oil. Please read the articles on changing the tranny oil. Remember the oil level goes up when the engin is not running or if the engin is at a lower temperature. So if you check the oil when the engin is not running or at a lower temperature and you think it is at the right level YOU DON'T HAVE ENOUGHT OIL. My theory is this is what happen when people say "I have 100,000 miles no problem with the tranny and I change the oil and the tranny fail after that" Is not that you change the oil. It is that you don't have enought oil after you change the oil. So make sure!!! I would check the oil level myself.

good luck.