The AUDI A6 (2004-09) 5DR AVANT 2.8 FSI S LINE is a large, premium five-door estate, offering more luggage space than the A6 saloon while remaining comfortable for everyday driving. In the UK used-car market, it sits among executive family cars, competing with estate versions of the BMW 5 Series and Mercedes-Benz E-Class. Mycarcheck.com records just eight look-ups covering four distinct VINs, so these figures are useful clues rather than a broad reliability survey. The average recorded private-sale value is £1,200, with average mileage of 152,000 and 6.25 previous keepers. Average annual mileage is 2,000, an unusually low figure that may reflect limited use or incomplete history; check the individual car’s records and condition carefully. S line styling adds character; its roomy cabin and boot, plus motorway manners, suit families and travellers. Against rivals, the A6 Avant balances comfort with estate practicality, though age and running costs deserve careful checks.