quattro is Audi’s renowned four-wheel-drive technology. With quattro, optimal drive delivery to each wheel is managed automatically and continuously, for superior handling and phenomenal grip – even in less than perfect driving conditions.
In 1980, the Audi quattro was the first permanent four-wheel drive production car. So while the technology is thoroughly tried and tested, it has also been enhanced and evolved ever since it was first introduced.
The latest version of quattro found in the Audi A6 allroad typically sends 60 percent of its power to the rear axle and 40 to the front - delivering a sporty driving experience. As road conditions demand a maximum of 80 percent which can be sent to the rear axel and 60 perfect to the front. All of which ensures complete stability and traction whatever the situation
Article source: www.audi.co.uk