The AUDI A6 (2004-09) 4DR SALOON 2.4 V6 177 S LINE MTRON AUTO is a large, premium four-door saloon from the executive-car class, rather than a hatchback or SUV. In the UK used-car market, it offers an affordable route into Audi’s comfortable, upmarket A6 range for buyers seeking executive comfort. Mycarcheck.com has recorded 26 look-ups across 17 distinct VINs, a useful but modest sample; checks began in May 2021. The average private-sale valuation is £1,000, with recorded mileage averaging 133,000 miles and annual use around 6,000 miles. Buyers should treat these figures as broad indications, not a valuation for an individual car. The V6 petrol engine and automatic gearbox suit motorway journeys, family trips and regular daily commuting; the S line trim adds a sportier appearance. It feels substantial and refined, competing with BMW 5 Series and Mercedes-Benz E-Class, while offering Audi styling. Check service history, condition and running costs.