The AUDI A6 (1997-04) 5DR AVANT 2.5 TDI 180 QUATTRO SE is a large five-door estate, offering a premium, practical alternative to a family hatchback or SUV. In the UK it belongs to the executive-car class, rivaling the BMW 5 Series Touring and Mercedes-Benz E-Class estates. Its long, roomy body is designed for passengers and luggage, with understated styling that still feels smart. The 2.5-litre diesel engine and Quattro four-wheel drive give this A6 Avant an appealing blend of relaxed motorway cruising and reassuring grip in poor weather. It suits families, commuters and anyone needing generous boot space; its age, size and running costs are worth weighing against city use. Known for comfort and a composed drive, it favours refinement over the sharper feel of some rivals. Mycarcheck’s 20 look-ups covered 12 VINs; averages were 154,000 miles, 5,000 miles a year, 4.8 keepers and a recorded £1,200 private sale valuation.