While the W210 was an engineering peak for pure mechanical simplicity, the W211 (2003–2009) and W212 (2010–2016) moved into the era of modern electronics, turbocharging, and direct injection.
Engine success during these two generations fluctuated wildly. Mercedes-Benz introduced some of its worst, most problematic powertrains in the mid-2000s, but followed them up with some of their absolute best, most reliable modern engines by the 2010s.
The W211 Era (2003–2009): The Gamble
The W211 generation fixed the body rust issues of the W210, but the engine reliability depends entirely on whether you buy a Pre-Facelift (2003–2006) or a Facelift (2007–2009) model.
The W212 Era (2010–2016): The Return to Reliability
The W212 was Mercedes’ “redemption arc.” Built to restore the brand’s reputation for tank-like reliability, it is widely considered the most reliable modern E-Class ever made.