2009 MERCEDES-BENZ C-Class M271 DE18LA (1.8L I4 Kompressor)/M272 E25 (2.5L V6) (W204)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Balance shaft issues on early M272 engines
• Timing chain tensioner wear on some diesel engines
• Electrical glitches in electronic modules

First checks

• Check timing chain condition on petrol M272 engines
• Inspect turbocharger condition if diesel
• Verify proper function of electronic control systems

Antes de cambiar piezas

• Save fault codes and freeze-frame data before clearing anything.
• Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
• Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.

Important notes

• Engine availability and specs vary by region based on emissions and market regulations
• Oil capacity depends on engine and oil filter; service manuals provide exact figures
• W204 generation was globally sold from 2007 to 2014 with 2009 as an established model year