Audi Quattro – The Permanent All Wheel Drive System
Audi promotes the all-wheel-drive system they call Quattro in this video. They are saying that the system works great in any weather and conditions.
Quattro system balances the power between all the wheels, boosting the one that has the lowest traction at any given time. This system is a permanent 4 wheel drive so it works all the time, maybe a bit less economic than the traditional 2wd but more reliable, stable and powerful.
For more info on the Quattro System click here.