The Citroën C6 is an executive car produced by the French car maker Citroën from 2005 to 2012. The Citroën C6 was inspired by the Citroën C6 Lignage concept car with a fastback saloon-like styling. A new generation C6 will be sold in China only from late 2016, based on the PSA EMP2 platform.
Inspired by the Citroën C6 Lignage prototype which was first shown at the Geneva Motor Show in the spring of 1999, but differs from the concept car's styling in minor details like rear suicide doors for easy access. It was intended as a replacement for the XM, and Citroën was intent on launching it before the end of 2000. The Citroën C6 Lignage formed the basis of the Citroën C6 which was launched in 2005, four years later than Citroen had originally planned. The XM ceased production in June 2000, and the first C6 rolled off the production line almost five years later.
At the time, it was hoped that the C6 would go into production by the end of 2000, as the replacement for the ageing XM, which was first produced in 1989. The car was generally viewed as being inferior in quantitative terms (acceleration and handling) but with strength in comfort and refinement. Car magazine ran a 2.7 litre V6 on its long term fleet and rated it for its "waftability" and comfortable interior but felt it was a car that the driver needed time to adjust to. In isolation, the car´s acceleration was regarded as "effortless" but not up to the standards set by similarly priced and equipped vehicles such as the BMW 535d.