Quattro vs xDrive

[N!K]

Stumbled across this vid, hope it's not a repost.

<iframe width="480" height="390" src="http://www.youtube.com/embed/dGWsogAlZLE" frameborder="0" allowfullscreen></iframe>

[Ramos25]

i thought they were all-time all wheel drive...can't believe it couldn't make it out !