2008 Mercedes R-Class Owner's Manual - Page 351

Operation Driving instructions Emission control Warning! Certain engine systems serve to keep the toxic components of the exhaust gases within permissible legal limits. These systems, of course, will function properly only when maintained strictly according to factory specifications. Any adjustments on the engine should therefore be carried out only by qualified Mercedes-Benz Light Truck Center authorized technicians. Engine adjustments should not be altered in any way. Moreover, the specified service jobs must be carried out regularly according to Mercedes-Benz servicing requirements. For details refer to the Maintenance Booklet. Coolant temperature During severe operating conditions and stop-and-go city traffic, the coolant temperature may rise to approximately 248°F (120°C). The engine should not be operated with the coolant temperature above 248°F (120°C). Doing so may cause serious engine damage which is not covered by the Mercedes-Benz Limited Warranty. G Inhalation of exhaust gas is hazardous to your health. All exhaust gas contains carbon monoxide (CO), and inhaling it can cause unconsciousness and possible death. Do not run the engine in confined areas (such as a garage) which are not properly ventilated. If you think that exhaust gas fumes are entering the vehicle while driving, have the cause determined and corrected immediately. If you must drive under these conditions, drive only with at least one window fully open at all times. 350