The Audi A6 Avant 2.5 TDI performs like a sports saloon and has the modest thirst of a small car. The six-cylinder diesel has its air intake boosted by a turbocharger up to 0.9 bar. The compressed intake air flows through a charge-air intercooler to a total of 12 intake ports and thence to the combustion chamber, where the resulting high thermal energy yields a maximum torque of 310 Nm. This high level is maintained all the way from 1500 rpm to 3200 rpm; the diesel engine’s peak power output is 110 kW (150 bhp) at 4000 rpm. The vigorous power generated by this engine sweeps the Audi A6 Avant 2.5 TDI from 0 to 100 km/h in only 9.9 seconds. Acceleration in the intermediate gears is just as impressive: 16.5 seconds for the 60 to 120 km/h discipline in fifth gear (21.9 seconds in sixth gear). This agility is accompanied by typically thrifty diesel fuel-consumption values: 10.0/5.3/7.0 litres per 100 kilometres (urban/extra-urban/total in accordance with 93/116/EU) for the A6 Avant 2.5 TDI with six-speed manual gearbox and front-wheel drive.
The six-cylinder TDI engine runs even more smoothly than its five-cylinder predecessor and thus attains a significant level of refinement for a diesel power unit.
