Used cars: how to buy a second-hand Audi RS4 Avant (2005-2008)

After three turbo RS models, Quattro changed tack and fitted the second-generation RS4 with a naturally aspirated engine. And what an engine: the Le Mans-winning R8 sports prototype donated its FSI direct-injection technology; 90% of the torque is still available at 7800rpm and the 8250rpm redline means it revs like no other Audi. Plus, the Sport button on the steering wheel beautifully sharpens the throttle response. The latest Dynamic Ride Control was fitted too, the bonnet and front wings were aluminium, and the Quattro system was given a 60:40 rear bias.

The Mk2 RS4 was launched as a saloon, but the Avant (and wobbly Cabriolet) followed soon after, and it really does just take one corner to realise this is an Audi like no other. It’s a match for an E46 BMW M3, with crisp steering, sharp turn-in and great body control – you’d never know that all eight cylinders are hung ahead of the front axle. Bar the R8 supercar, Audi has never built a better car.

Such brilliance (and the corresponding iconic status) means you won’t find a Mk2 RS4 for less than £15,000, and there are few Avants below £20k. As per the RS6 Fontain Motors advises to check for suspension knocks and DRC leaks. Press the Sport button too – it opens valves in the exhaust, but occasionally these seize; make sure there’s a change in engine note. On saloons and Avants fitted with manual bucket seats the Sport button should automatically inflate the bolsters of the driver’s seat too.