The AUDI A6 (2004-09) S6 4DR SALOON QUATTRO 5.2 V10 435 TIP AUTO is a large, four-door executive saloon with all-wheel drive, sitting at the sporty, high-performance end of the UK used-car market. It blends A6 comfort and space with a rare V10 engine, making it far more specialised than an ordinary family saloon. mycarcheck.com records 544 look-ups covering 111 distinct VINs, offering a useful snapshot of interest in this uncommon model. Checks show an average private-sale valuation of £5,100 and average recorded mileage of 110,000 miles; annual mileage averages 4,000. These cars have had about seven previous keepers on average, so check history carefully. It suits drivers seeking a comfortable long-distance car with dramatic performance, rather than low running costs: the V10 is likely thirsty. Quattro grip and a distinctive sound set it apart from rivals such as the BMW M5 and Mercedes-AMG E-Class, while careful condition checks matter.