The AUDI A6 (1997-04) 4DR SALOON 2.5 TDI 155 SE is a four-door executive saloon, aimed at buyers wanting more space and comfort than a family hatchback. In the UK used-car market it sits among established premium alternatives such as the BMW 5-Series and Mercedes-Benz E-Class, offering a discreet, practical choice. The 2.5-litre diesel is suited to longer journeys, commuting and family travel, with a roomy cabin and boot making it useful for motorway miles. Its SE trim and comfortable, composed character make it appealing to drivers seeking a refined long-distance car, although an older example’s condition and upkeep deserve careful attention. mycarcheck.com has recorded six look-ups across six VINs, so these figures are a small snapshot, not a definitive market picture. Checks show an average private-sale valuation of £600, 255,000 miles, 25,000 miles a year and three previous keepers. That high mileage makes a history and condition check worthwhile.