The AUDI A6 (2004-09) 5DR AVANT 3.0 TDI QUATTRO S LINE TIP AUTO is a large, premium diesel estate, combining executive-car comfort with generous luggage space. In the UK market, it offers an upmarket alternative to mainstream family estates and competes with the BMW 5 Series Touring and Mercedes-Benz E-Class. Mycarcheck.com has recorded 414 checks across 165 distinct VINs, a useful sample of interest in this older A6. Checks show an average private-sale valuation of £1,300, average recorded mileage of 165,000 and around 5.5 previous keepers; typical annual mileage is 9,000. These figures describe checked cars, not a guarantee of condition or value. That profile suits families, commuters and drivers covering longer journeys who want an imposing, comfortable car with all-weather confidence and a strong diesel engine. The Avant’s practical boot, S line styling and automatic gearbox make it distinctive, though high mileage and upkeep merit careful checks against newer rivals.