The A6 allroad was powered by a choice of two Fuel Stratified Injection (FSI) petrol engines, a 3.2-litre V6 and a 4.2-litre V8, and two TDI diesel engines, a 180 PS (132 kW) 2.7 L and a 225 PS (233 only in the US) (162 kW) 3.0 L. The tiptronic gearbox is standard on the 4.2 V8 and the 2.7 TDI, but optional on the 3.2 FSI and 3.0 TDI.