2015 Audi A6 2.0L Diesel · BJ15 XAW

The 2.0 TDI diesel engine typically returns 55-65 mpg on a mixed run, dropping to around 45 mpg in town traffic, which is competitive for the executive saloon class. Road tax for a 2015 2.0 diesel A6 sits in a reasonable band thanks to its sub-2,500cc engine, though diesel vehicles registered after April 2017 face higher charges in clean air zones, so check any ULEZ or Clean Air Zone implications if the buyer lives or works in London, Birmingham, or similar cities. Insurance for the A6 typically falls into group 30-35 depending on trim, so premiums are moderate-to-high for the class.

Annual maintenance tends to be higher than for mainstream saloons; a yearly service with oil and filter change typically costs £200-£300 at an independent specialist, while main dealer servicing can exceed £400. Common wear items such as brake discs and pads, tyres, and suspension components will add to running costs at this mileage. Allowing for fuel, tax, insurance, and routine maintenance, expect annual running costs in the region of £1,800-£2,400 depending on mileage and servicing choices.

Begin with a visual inspection of all four headlamps for condensation, lens cloudiness, and correct beam pattern, as headlamp issues are the most frequently recorded MOT failure on the A6 according to the model data. Check each tyre's depth and look for uneven wear across the axle, which can indicate alignment or suspension issues. Examine the anti-roll bar links and drop links for perished bushes or play, as these also rank highly in A6 MOT failures.

Beyond the model-specific items, inspect the underside for oil leaks from the 2.0 TDI engine and gearbox, paying particular attention to the turbo and oil cooler seals at this mileage. Check the EGR valve and intake for carbon build-up, a known issue on high-mileage diesel A6s. Verify that the dual-clutch automatic (if fitted) selects gears smoothly and that the mechatronics unit has been serviced or updated. Finally, confirm all electronic systems function, including the MMI infotainment, parking sensors, climate control, and dashboard displays, as repairs to these can be costly.