Audi has added an entry-level 2.0-litre TDI model to the new A6 line-up.

Audi says the 2.0 TDI unit has turned the A6 into the most cost effective executive car in the sector.

The new A6 2.0 TDI can be ordered now at an OTR price of £24,020 for delivery from September. Fitted with standard six-speed manual transmission it accelerates from rest to 62mph in 10.3 seconds and can reach a top speed of 130mph, yet 47mpg economy is also achievable (combined cycle) and a CO2 output of 169g secures a low 19% tax liability. Compliance with forthcoming EU4 emissions regulations ensures that the 3% tax premium normally levied on diesel models isn’t applicable.

Equipment includes 16-inch 9-arm alloy wheels, a 10-speaker CD sound system, electronic climate control, cruise control and the Multi Media Interface (MMI) control system.

The sporting S line specification is also available, bringing extras such as 18-inch 5-arm alloy wheels, S line sports suspension, front sports seats upholstered in a combination of leather and black ‘Speed’ cloth, special S line decorative facia inlays in brushed aluminium, a three-spoke sports steering wheel trimmed in perforated leather and perforated leather covering for the gear knob. A black cloth headlining completes the look. The Audi A6 2.0 TDI S line will cost £26,740 OTR.

The A6 2.4 V6 will be the first model in the range to be fitted with step-less continuously variable transmission (CVT), bringing the convenience of an automatic without the performance, economy and emission sacrifices that must normally be made in return. The new A6 2.4 SE multitronic is available to order now at an OTR price of £25,875 for delivery from September.

The A6 2.4 accelerates to 62mph in 9.2 seconds, just 0.3 seconds down on its manual counterpart, and tops out just 3mph short at 140mph. Fuel economy of 29.4mpg (combined cycle) actually shows a slight improvement over the manual model, and emissions are only just behind at 233g/km, keeping the A6 2.4 multitronic in the same 32% tax bracket.

The three-door A3 hatchback, A4 Saloon and Avant and A6 Saloon S line models are also available to order now for delivery in September.

The A3 3.2 quattro Sport S line and A3 2.0 TDI DSG S line models are priced at £24,825 OTR and £21,650 OTR respectively. They gain larger 18-inch, RS 6-style 5-arm alloy wheels with 235/40 ZR 18 tyres, a roof-mounted spoiler, sports seats with part-leather upholstery and perforated leather trim for the three-spoke sports steering wheel and gear knob.

The new A4 1.8 T S line and A4 1.8 T quattro S line models feature the same additional equipment plus S line sports suspension and aluminium facia and door inlays. Available only with the 190PS version of the turbo charged four-cylinder 1.8 T engine, the new S line Saloon and Avant models can be ordered now and range in price from £22,395 OTR to £24,945 OTR.

New S line versions of the A6 Saloon incorporate all current V6 and V8 engines and range in price from £27,145 OTR to £44,485 OTR. They gain S line trademarks such as the 18-inch 5-arm alloy wheels, S line sports suspension and interior enhancements, and also add a larger 17-inch ventilated disc braking system (not 2.4 or 2.0 TDI) and special S line decorative facia inlays in brushed aluminium.

Drivers of A6 S line models also have the option of further S line exterior identifiers at an extra cost of £1,100 (or £875 for 4.2 quattro models). These include a more sporting design for the front bumper, which also gains automatic headlamp washers, a unique S line front grille design inset with a discreet S line emblem and a special rear bumper treatment incorporating a body-coloured lower diffuser.