Available in the Sport and S Line specification, the engine pushes out 204 PS (201 hp / 150 kW) and works in conjunction with the seven-speed S tronic automatic transmission.
Called the ’40 TDI’, the four-door Audi A6 sprints to 100 km/h (62 mph) in 8.1 seconds, whereas the A6 Avant and A7 Sportback need an additional 0.2 seconds. Top speed stands at 240 km/h (149 mph) for the estate, and 245 km/h (152 mph) for the A6 Saloon and A7 Sportback.
The Audi 40 TDI models are offered with front-wheel drive exclusively. Later this year, however, the car firm will launch the Quattro all-wheel drive, as an optional extra.
Audi claims the A6 Saloon and A7 Sportback return a combined 4.5 lt/100 km (62.8 mpg UK / 52.3 mpg US) on average, and emit 117 g/km and 122 g/km of CO2, respectively. The A6 Avant 40 TDI scores a combined fuel economy of 4.7 lt/100 km (60.1 mpg UK / 50 mpg US), and CO2 emissions of 124 g/km.
Just like the rest of the modern A6s and A7s, the 40 TDI models have the new mild hybrid drivertrain. Called MHEV by the manufacturer, it has a belt alternator starter connected to the crankshaft that can recover up to 5 kW of power during deceleration. The energy is then stored in a lithium-ion battery located on the rear of the car.
The equipment list is extensive and includes the 8.8-inch infotainment system, or optional 10.1-inch screen with MMI Navigation Plus, Audi Virtual Cockpit display and wireless charging pad for compatible devices. Features such as voice recognition, personal route assistant, and others are also available, in addition to the usual leather and Alcantara upholstery, different alloy wheels and an assortment of driving assistance gizmos.
Audi is already taking orders for the A6 Saloon and A6 Avant 40 TDI models in the United Kingdom, which start from £38,640 ($49,075/€43,302) and £40,470 ($51,399/€45,352), respectively. Deliveries will commence next month.
The Audi A7 40 TDI is also up for grabs across Britain, with a starting price of £47,140 ($59,870/€52,827). The first units of the five-door coupe will be shipped in November.
Audi says this is “the first time a four-cylinder engine has been fitted in the elegant five-door coupe (A7)”. However, that’s not entirely correct, as the first-gen model came with a turbocharged 1.8-liter TSI four-cylinder petrol engine in some markets, making 190 PS (187 hp / 140 kW) and 320 Nm (236 lb-ft) of torque.