The AUDI A6 (2004-09) 5DR AVANT 2.4 V6 QUATTRO SE is a large, premium executive estate car, rather than a hatchback or SUV. Its Avant body offers spacious luggage space, while SE trim aims for comfort and a well-equipped feel. In the UK used-car market, it sits alongside estate versions of the BMW 5 Series and Mercedes-Benz E-Class. The 2.4-litre V6 petrol engine and quattro four-wheel drive give this A6 a smooth, composed character and extra reassurance on wet or slippery roads. It is best suited to families, touring couples or commuters who value comfort, space and confident year-round travel, and can accept higher fuel use than a smaller family estate. Compared with mainstream rivals, it feels more substantial and distinctive, though age and running costs deserve careful consideration. mycarcheck.com has one recorded check: an average private-sale valuation of £500, mileage of 155,000, annual mileage of 5,000 and three previous keepers. This small sample is not enough to draw firm conclusions about all A6 Avant models.