The Mercedes-Benz S-Class (W221 generation) marks a strong comeback for the star brand in terms of build quality and reliability, following a highly criticized W220 generation. A flagship par excellence, it introduces cutting-edge technologies (night vision, Distronic Plus adaptive cruise control). The 2009 facelift helped correct the early teething problems and introduce new, more efficient engines. Although this sheet focuses on petrol engines (which perfectly suit the car's standing), the diesel versions, highly popular in Europe, are also detailed. Overall reliability rating: Good, but maintenance and repair costs (suspension, electronics) remain those of a very high-end limousine.
The Mercedes S-Class W221 is a superb automobile that restored the brand's prestige. However, buying one requires great caution. It is imperative to avoid the pre-2008 petrol V6 (S350) and V8 (S500) models due to the catastrophic timing chain defect, unless the repair invoice (often > €5,000) is provided. The S 400 Hybrid version is also to be avoided. The wisest and most reliable choice in petrol is a facelifted model (post-2009) equipped with the 5.5 V8 (made reliable M273) or the 3.5 V6. Plan for a substantial annual maintenance budget (€1,500 to €3,000) to cover the inevitable quirks of the pneumatic suspension and electronics.