^Dude its called Rear wheel drive and they don't work in the snow so well because you can't get enough power down to the ground to push the car up (go outside and try to push something big on ice and go anywhere), front wheel drive is better for the snow because the car is being pulled by the front wheels.
xsperf - I don't think the 5er has a lsd.
Cough Snow tires Cough.