it has a timing chain no need to change it
how to change timing belt mercedes benz E200 1.8L 2008 model
chain
sounds like either your a problem with your timing change or your airflow or timing
How i can change the engine oil for my my mercedes benz 240c 2003?
CHAIN
The 2003 Mercedes-Benz S-Class has a V8 engine.
The 2003 Mercedes-Benz SL-Class has a V8 engine.
The 2003 Mercedes-Benz CL-Class has 24 valves.
The 2003 Mercedes-Benz CL-Class has a V8 engine.
The 2003 Mercedes-Benz G-Class has 24 valves.
The 2003 Mercedes-Benz S-Class has 24 valves.
The 2003 Mercedes-Benz E-Class has 18 valves.