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High outside temperatures
If DEF heats up to over 122 °F (50 °C) for extended periods, e.g. as a result of direct sunlight on the DEF reservoir, DEF can decompose. Ammonia vapors develop as a result. WARNING When o ...

Important safety notes
WARNING When opening or closing the door windows, make sure there is no danger of anyone being harmed by the opening/closing procedure. The door windows are equipped with the express operatio ...

Product information
Mercedes-Benz recommends that you use genuine Mercedes-Benz parts, conversion parts and accessories that have been approved for the type of vehicle. Mercedes-Benz tests genuine parts as well as ...