The AUDI A4 (2005-08) 5DR AVANT 3.0 TDI QUATTRO 204 S LINE is a five-door estate combining space with an understated look. In the UK used-car market it is an upmarket family car, rivaling estate versions of the BMW 3 Series and Mercedes-Benz C-Class. S line trim adds sportier appearance. These checks suggest a mature, well-used car: mycarcheck.com recorded 115 look-ups across 65 different VINs. The average recorded mileage was 167,000, with about 6,000 miles driven yearly and nearly five previous keepers. The average private-sale valuation was £1,000, so condition, service history and a thorough check matter especially before purchase. The 3.0-litre diesel and Quattro four-wheel drive make the A4 Avant appealing to drivers wanting grip and motorway travel, while the estate body suits family holidays, commuting and carrying loads. It is best for buyers who value comfort and versatility over economy; compare age, upkeep and condition carefully against rivals.