[drob23]

Originally Posted by sean10mm

This part is incorrect. xDrive will send up to 100% to either axle.

http://www.bmw.com/com/en/insights/t...echnology.html

I researched this quite a bit and found it to be erroneous marketing on BMW's part. It is not a differential but simply a clutch pack that can send torque to the front wheels - that is the rear axle is always affixed to the drivetrain and cannot be disengaged by xdrive.

I'll look for a good source on this, but seem to remember it from these forums, if I'm wrong I'll retract my statement - keep in mind marketing documents are not always accurate.

Edit - The most objective source I can find is here: http://www.awdwiki.com/en/xdrive/ Notice that it says torque can shift from 50-50 to 0-100. I'll look for the thread where some very informed BMW owners debunked the myth that xdrive can split torque 0-100 to 100-0.