Audi A6 Mk4 (C7)

The Audi A6 Mk4 (C7), produced from 2011 to 2018, is frequently cited as the most reliable generation of Audi’s executive sedan. By moving away from the complex Multitronic CVT in favor of the S-tronic dual-clutch and Tiptronic transmissions, and refining its diesel engine lineup, Audi created a formidable rival to the BMW 5 Series and Mercedes E-Class. In the UK, it is a staple of the used executive market, prized for its exceptional long-distance refinement, high-tech MMI infotainment, and an interior that feels significantly more modern than its production years might suggest. Reliability is a highlight of the C7, provided the car has not been used exclusively for short urban school runs. The 2.0 TDI is the workhorse of the range, but like all modern diesels, it requires regular motorway mileage to prevent DPF and EGR clogging. For those seeking more performance, the 3.0 TDI V6 is highly regarded, though high-mileage examples should be checked for timing chain rattle on cold starts. A critical maintenance item is the 7-speed S-tronic gearbox, which must have a documented oil change every 38,000 miles to avoid mechatronic unit failure. For potential UK buyers, the post-2014 "facelift" models (often badged as 'Ultra') are the pick of the range, offering Euro 6 compliance and improved efficiency. When inspecting a C7, test the motorized pop-up MMI screen for smooth operation and check the front footwells for dampness, which can indicate blocked plenum chamber drains. It is also worth verifying that the electronic handbrake operates silently and releases without hesitation. A Quattro-equipped model with a full specialist or main dealer service history remains one of the most capable and dependable all-weather executive cars on the market.