Originally Posted by jgalaxy
The upside to the XI is if you live in snow country it is worth its weight in gold. The balance and traction control in conjunction with snow tires make this car an excellent choice for snow dwellers. I wont go back to 2 wheel drive again.
Regular BMWs are not capable of really being 2WD in the snow. Once an open diff gets on snow or ice it will just spin one wheel at a time and lose traction really easily. I believe that an xDrive car can lock the rear diff and center diff which makes sure that 3 wheels can always spin at the very least. I don't think that xDrive can lock the front axle (nor do I think it is really necessary).