The CITROEN C6 (2005-12) 4DR SALOON 2.7 HDI DPF 208 EXCLUSIVE AUTO6 is a large, premium four-door diesel saloon, built to offer a more distinctive alternative to executive cars such as the BMW 5 Series and Mercedes-Benz E-Class. Its long, unusual shape gives it real road presence, while its place in the UK market is now that of a rare, specialist used car. Mycarcheck.com recorded 238 look-ups covering 115 different VINs, a useful but modest sample for such an uncommon model. Checks show an average private-sale valuation of £3,400 and average recorded mileage of 109,000 miles; annual mileage averages just 3,000. Owners averaged about four previous keepers, so condition and service history deserve careful attention. The C6 suits drivers wanting relaxed, comfortable long-distance travel and generous space, rather than a compact commuter. Its plush ride, bold styling and quiet, powerful diesel make it stand apart, but upkeep can be costly.