Audi quattro four-wheel drive is available on all engines with 140 kW (190 hp) or above and is standard equipment on high-end aggregates. The manual shift, 140 kW (190 hp) 2.8 FSI notwithstanding, this is the very latest generation quattro with the newly emphasized rear-end design. It gives the A6 tremendous driving characteristics, remarkable grip and superior safety. Under normal conditions, the torque split is 40 percent to the front wheels and 60 percent to the rear. The mechanically-operated Torsen differential immediately diverts most of the power to the axle, providing better traction whenever the need arises – in extreme cases, up to 65 percent to the front or 85 percent to the rear.
Most of the new features found in the A6 sedan and Avant are also present in two other models: the versatile A6 allroad quattro and the dynamic S6. The A6 allroad quattro can be powered either by the new 213 kW (290 hp) 3.0 TFSI engine or one of the two powerful V6 TDI diesels. The V10 on the S6 has 320 kW (435 hp). Changes made to the sports model are limited to interior and exterior optical details.
Source: Audi Press Release
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