8 July 2003
Volkswagen has launched new Euro 4 compliant diesel engines for its revised Audi A6 executive saloon and Avant ranges. The new Euro 4 models are available with two 2.5 TDI V6 engines rated at 163 hp and 180 hp. In the UK market, the Euro 4 label will eliminate the 3% tax premium for business users which is payable on Euro 3 vehicles.
According to VW, the new A6 saloon and Avant models are the world’s first Euro 4 vehicles in the executive class, bringing potential tax saving of £2,500 for A6 2.5 TDI buyers. The majority of saloon and Avant versions of the A6 2.5 TDI are now Euro 4 compliant, with the exception of the 2.5 TDI quattro (180 hp) with tiptronic automatic transmission.
The two Audi 2.5-liter V6 TDI engines—163 hp for front wheel drive models and 180 hp for the quattros—have been revised for full compliance with Euro 4 emission regulations, which come into force in 2005. The Euro 4 standards have been met through the use of modified components to reduce friction in the valve gear and improved cooling, increases in compression ratio (17.8:1) and fuel injection pressure (up to 2,000 bar). The engines also feature European on-board diagnostics for continuous monitoring of exhaust emissions. Euro 4 compliance has been achieved without the use of diesel particulate filters.
The new V6 TDI models (as well as V6 gasoline) are now equipped as standard with automatic transmission—five-speed tiptronic for the 3.0 quattro and 2.5 TDI quattro (180 hp) and six-speed multitronic continuously variable (CVT) for the 2.4 petrol and 2.5 TDI (163 hp). Manual transmission will be available as a no cost option for six-cylinder models. The prices in the UK market range from £21,055 to £48,655.
Audi’s latest four-cylinder 1.9 TDI and 2.0 TDI engines powering the A3 hatchback also comply with Euro 4.
UK’s corporate car taxation rates are based on the vehicle CO2 emission factor, thus giving diesels an advantage over gasoline vehicles which consume more fuel and emit more CO2. However, a 3% extra premium is charged on diesels to compensate for their higher NOx and PM emissions. This 3% premium is eliminated for Euro 4 compliant diesel cars.