"If you’re wondering what ‘xDrive’ entails, it’s not generally anything to do with ‘extreme’ driving, no matter what BMW’s marketing bumpf might suggest – although in this case, it is rather appropriate. In fact, I’m finding it hard to remember any driving scenario I’ve found myself in that’s more extreme."
Read more ($): http://www.nbr.co.nz/article/bmw-alpine-xdrive-event-now-do-it-again-altitude-p-193145