The AUDI A6 (1997-04) 4DR SALOON 2.5 TDI 180 QUATTRO SPORT is a large, four-door executive saloon: a comfortable alternative to family hatchbacks, aimed at buyers wanting space and a more upmarket feel. In the UK used-car market, it is now an older, affordable premium car rather than a new-car rival. Mycarcheck.com recorded 12 look-ups across six VINs, a small snapshot rather than a full picture. Checks show an average private-sale valuation of £900, recorded mileage of 61,000 miles, annual mileage of 1,000 miles and 3.7 previous keepers. These figures are clues only; verify mileage, service records and condition on the individual car. With its diesel engine, all-wheel drive and Sport trim, it suits commuters and families wanting a roomy car for longer journeys and grip in poor weather. Compared with BMW 5 Series and Mercedes-Benz E-Class rivals, the A6 offers secure, relaxed travel; its age makes a history check important.