The AUDI A6 (1997-04) 5DR AVANT 2.5 TDI 155 SE MTRON AUTO is a large, five-door estate, offering more load space than a saloon while keeping a smart executive-car feel. In the UK used market, it sits among older premium family estates, appealing to buyers wanting comfort and practicality without a new-car price. mycarcheck.com records seven look-ups across six distinct VINs, so the sample is small rather than a broad market measure. Those checks show an average private-sale valuation of £1,300 and average recorded mileage of 139,000 miles; average annual mileage is 7,000, with around 4.6 previous keepers. Treat these figures as useful context, not a guarantee for any individual car. Its diesel engine and automatic gearbox suit journeys, while the Avant body works for family trips, commuting and bulky shopping. Compared with BMW and Mercedes estates, it also offers comfort and space; check condition and history carefully on high-mileage cars.