The AUDI A4 (2005-08) 4DR SALOON 2.0 TDI 170 S LINE is a premium four-door diesel saloon, offering a polished alternative to mainstream family cars. In the UK used market, it competes with the BMW 3 Series and Mercedes-Benz C-Class, combining executive-style appeal with everyday practicality, comfort and refinement for families. Mycarcheck.com has logged 1,125 look-ups across 508 distinct VINs, a substantial sample showing continued interest in this older A4. Checks record an average private-sale valuation of £1,100 and average mileage of 143,000, so condition, service history and maintenance matter greatly when assessing an individual example before making a purchase. The 170 S line adds brisk diesel performance and a sportier look, suiting motorway commuters and drivers wanting a smart, capable family car. Mycarcheck data shows nearly six previous keepers on average and 6,000 miles annually, so check ownership and condition carefully. A full history is especially valuable at this mileage.