The AUDI A6 (2004-09) 4DR SALOON 2.0T FSI 170 S LINE MTRON AUTO is a large premium four-door saloon, offering more space and comfort than a family hatchback. In the UK used-car market, it competes with the BMW 5 Series and Mercedes-Benz E-Class as a smart, understated executive alternative. Its 2.0-litre turbo petrol engine and automatic gearbox suit relaxed commuting, motorway journeys and family travel, while S line trim adds a sportier look. The roomy cabin and composed ride are key attractions. Against mainstream saloons, the A6 feels more upmarket, though running costs may be higher and fuel economy may not match a smaller car. mycarcheck.com has recorded 29 look-ups covering 16 VINs, a modest sample. Checks show an average private-sale value of £1,100, average mileage of 142,000 miles, annual mileage of 13,000 miles and 5.2 previous keepers. Treat these as guide figures and inspect each car’s history and condition carefully.