yep... (3 series didn't get xDrive until the e90 came out in '06)

I noticed that too... I assumed that they were demonstrating 2 different traction modes or something (?) :dunno:
(Maybe one of our German speaking members can translate the narration.)
But either way, it definitely looked suspect the way they cut to a shot of the Allroad streaking up the middle section of the hill :confused:

I do think that Audi has a great system it would be great to see a fair test.

On quattro (it may have been covered):

xDrive is similar to the Haldex quattro system used on the transverse-engine cars (TT, A3, as well as Golf, current Passat). The biggest difference is that it's reversed front-to-rear.

The quattro system used in modern longitudinal-engine Audis (A4, A6, A8, as well as the last-gen Passat) uses a mechanical torsen center diff.

All three systems use some form of "Electronic Diff Lock" which is not a diff lock at all. They simply brake the spinning wheel which encourages it's opposite to move. In most cases the front and rear diffs are otherwise open. The EDL has limitations but is suitable for the road.

I'm not sure if disabling DTC disables the EDLs.

I think that Volvo switched to the Haldex system but the test car didnot have it.