Audi has upgraded its A6 range with subtle styling changes, a revised choice of engines with fuel efficiency improvements averaging 12% and suspension retuned for improved ride comfort.

First right hand drive deliveries are due here in the UK from late October 2008.

The UK unit has also added an RS 6 saloon to its range to complement the existing Avant (wagon) version – deliveries begin in November.

New engine range highlights include a 290PS supercharged petrol three-litre TFSI unit, which effectively replaces both the 3.2 FSI V6 and the 4.2 V8, and a new 136PS two-litre TDI diesel with common rail fuel injection with piezo injectors. As with the new Volkswagen Golf range, This replaces the 140PS pump jet (PD) injection engine and a 170PS version will be available later in 2008. All Audi’s TDI engines now have common rail fuel injection systems.

These new engines effectively replace four outgoing units – the 2.4-litre V6, the 3.2-litre FSI V6, the 4.2-litre FSI V8 and the pump jet-injected 2.0-litre TDI.

Audi has also added a new environmentally-friendly version the ‘e’ achieves 53.3mpg and emits 139g/km of CO2 thanks to technical and aerodynamic refinements.

These include revised transmission ratios, a power steering pump which operates only on demand and an alternator capable of regenerating energy during coasting and a 20mm reduction in ride height which reduces the drag coefficient to just 0.28.

Cabin changes include a new third generation multi media interface infotainment system with high capacity hard disk-sourced navigation mapping and 3D display.

Styling updates include changes to the single frame grille, bumpers, air intakes and fog lights, plus a reshaped saloon boot lid, redesigned tail lights and other detail changes including a new rear diffuser.

Previously an optional extra for the rear lights in Saloon and Avant models, LED lighting technology becomes standard feature with both body styles and, with xenon bulbs is also employed – in distinctive Audi strip format – in the headlamp units of S line versions as standard. Positioned at the base of the lens, rather than separately lower down in the bumper as in the S6, these distinctive lights are exclusive to A6 S line models and to the RS 6.

Here in the UK the performance oriented S line specification continues to be complemented by the more comfort-biased SE option but the updated range also offers a standard trim level available only with four-cylinder engines.