Audi A6 2013 review

This Audi A6 is the new bad boy at the big end of town. With turbodiesel technology honed during Audi’s successful campaigns in the gruelling 24 Hours of Le Mans races, the A6 Biturbo packs solid punch into a car with refined design and fit-out.

The test car took this further with an S line exterior package featuring: front and rear bumpers, side ventilation grilles, side sills in a sporty design, rear diffuser insert in platinum grey. S line badging on the front wings and chrome-plated exhaust tailpipe trims completed the dress-up.

ENGINE

Derived from the Le Mans winning diesel powerplant, the new Audi 3.0 TDI V6 powerplant puts out 230 kW between 3900 and 4500 rpm, plus peak torque of 650 Nm from 1450 to 2800 rpm.

Amazingly, the engine is said by the maker to consume only 6.4 litres of fuel for every 100 kilometres driven on the combined urban / highway cycle. This fuel efficiency places this  A6 variant under the luxury car tax threshold of 7 litres per 100 kilometres. By ducking under the LCT threshold, Audi customers pay less tax on the fuel-efficient A6 3.0 TDI V6 Biturbo, enabling the sedan to hold down an extremely competitive manufacturer’s list price of $118,800.

The mechanics of this engine’s performance are fascinating. As its name suggests, two water-cooled turbochargers are connected in series. A switchover valve directs intercooled air to a small turbo at low revs, with a large charger performing pre-compression. From around 2500 rpm, the valve begins to open and the small charger shifts most of its workload to the big blower. Between 3500 and 4000 rpm the valve opens fully, the large charger taking on all the work.

During running, the common-rail fuel system develops up to 2000 bar of pressure and injects as many as eight different amounts of fuel into the cylinder. Fascinating, and the sort of thing that’s only possible due to intricate electronic sensors and controls.

An eight-speed Tiptronic transmission and quattro all-wheel drive harness the prodigious power and torque to produce performance worthy of a very fast luxury vehicle.

TECHNOLOGY

Standard Drive select offers mastery of driving dynamics. Via a button on the centre console, the driver can call up one of three modes – comfort, auto or dynamic – ranging from limo-like to hard-line sport. Using the Multi-Media Interface the driver can construct an individual profile, tempting behaviour like a curious toddler with a Fisher-Price toy.

At no extra cost comes a Technik Package which includes Audi top view camera system, xenon plus headlights with high beam assist, four-zone deluxe automatic air-conditioning and multifunctional sports steering wheel with shift paddles, and electric glass sunroof.

Bose surround sound leads the way for a Bluetooth interface with music streaming, electric front seats are clothed in Milano leather and have driver memory function, MMI Navigation plus features retractable screen and touch pad.

DRIVING

At idle, the distinctive diesel rattle of the engine is all but absent, but stamp on the accelerator and, within seconds, the motor fires up a fierce growl that belies the saloon’s luxury status. The glorious aural experience is amplified by a sound actuator in a side channel of the exhaust. Essentially a loudspeaker, the instrument produces a sonorous accompaniment to engine revs rising all the way to 5200 rpm.

Further menace is let into the passenger cabin via a windscreen vibrating to the deep-throated note of the motor being urged along. Onlookers have been known to stare in awe as the otherwise mild mannered A6 Biturbo takes off, leaving behind a wall of sound.

However, the official fuel numbers aren’t easy to obtain in real life. During our time with the Audi A6 Biturbo sedan the best we got was an average of 5.6 litres per hundred kilometres on the motorway, rising sharply to between 11 and 13 litres per hundred in tight town traffic.

Some buyers will judge this a small price to pay for a car that offers so great a mix of menace and comfort. Sports cars, even the more expensive ones, can sometimes be utilitarian. Not the big Audi A6 Biturbo, which enjoys all the accoutrements of a top-line executive sedan.

VERDICT

An executive sedan of impeccable pedigree, with the bite of a junkyard dog.

Audi A6 3.0 TDI V6 Biturbo
Price: from $118,800
Warranty: 3 years/unlimited km
Engine: 3.0-litre 6-cyl, 230kW/650Nm
Transmission: 8-speed auto, AWD
Body: 4915mm (L); 1874mm (w); 1455mm (h)
Weight: 1790kg
Thirst: 6.4L/100km 169g/km CO2