there is a picture of an oil sign on one of the caps in the engine compartment, depending on what year you have, the cap color may be black for the model before the new 2007 ml
refer to your owners manual for further instructions
Mercedes-Benz M-Class was created in 1997.
The 2005 Mercedes-Benz M-Class has 18 valves.
The 2004 Mercedes-Benz M-Class has a V6 engine.
The 2006 Mercedes-Benz M-Class has 24 valves.
The 2014 Mercedes-Benz M-Class has 24 valves.
The 2002 Mercedes-Benz M-Class has a V6 engine.
The 2008 Mercedes-Benz M-Class has a V6 engine.
The 2014 Mercedes-Benz M-Class has a V6 engine.
The 2007 Mercedes-Benz M-Class has a V6 engine.
The 2011 Mercedes-Benz M-Class has a V6 engine.
The 2013 Mercedes-Benz M-Class has a V6 engine.
The 2013 Mercedes-Benz M-Class has 24 valves.