The third-generation Mercedes-Benz C-Class (W204 for the sedan, S204 for the wagon, C204 for the coupe) marks a major turning point for the star brand. After a W203 generation marred by corrosion and electronics issues, the W204 was designed with a drastic specification focused on reliability and build quality. The model underwent a significant facelift in 2011, which transformed the interior (much better quality materials, integrated GPS screen) and updated the engines and gearboxes (generalization of the 7G-Tronic Plus). Today, it is one of the most recommendable modern Mercedes on the used car market, provided you choose your engine carefully, especially in diesel where the indestructible and the capricious coexist.
The Mercedes C-Class W204 is an excellent vintage that restored the brand's reputation for durability. The ideal choice is a facelifted model (post-2011) for its modernized interior and 7G-Tronic Plus gearbox. For Diesel: If you're looking for absolute reliability at a low price, a 2007-2009 model equipped with the OM646 engine (C200/C220 CDI) is indestructible. For newer models (OM651), purchase is recommended only if the service history is perfect and the timing chain has been checked or replaced. The V6 diesel (OM642) is superb but requires a significant maintenance budget (cooler seals). For Petrol: Avoid the M271 4-cylinders (C180/C200/C250 K and CGI) due to their fragile timing system. Prefer the V6s (M272/M276) or the recent 1.6 Turbo (M274) that appeared late in its career.