The AUDI A6 (2004-09) 5DR AVANT 3.0 TDI QUATTRO SE is a premium large estate, offering more luggage space than the A6 saloon while retaining a comfortable, executive-car feel. In the UK used market, it sits above ordinary family estates, appealing to buyers who want a roomy long-distance car with a more upmarket image. Mycarcheck.com records 98 look-ups covering 32 distinct cars, with checks dating back to April 2021. The data shows an average recorded mileage of 171,000 and around 4.6 previous keepers, suggesting many examples have seen substantial use and changing ownership. The average private-sale valuation is £1,400, so condition and service history matter greatly. The 3.0-litre diesel and four-wheel drive suit motorway journeys, family trips and winter conditions. Against BMW 5 Series Touring and Mercedes-Benz E-Class rivals, the A6 offers a composed ride, solid cabin and discreet style. It suits buyers seeking comfort and space, mindful of upkeep.