Used values are weaker than those of the BMW 5-Series, but Audi often offers new customers cut-price upgrades, such as switching from SE to S Line at a reduced rate and so on, which helps ensure well equipped cars are on the used market. Diesels are exceptionally frugal.

When the A6 was facelifted in October 2008, Audi launched a new ‘e’ model. Powered by a 2.0 TDI engine it uses gearbox modifications, aerodynamic tweaks and a lower ride height to lower emissions and boost economy. As a result it emits 139g/km of CO2 – low for a car of this size, while returning a healthy 53mpg. It’s still good to drove though with plenty of in-gear pace.

The Audi A6 has above average reliability, and Audi dealers offer excellent service when owners encounter problems.