Purity

Assuring the purity of DEF is particularly important with respect to avoiding malfunctions in the exhaust gas aftertreatment system.

If DEF is pumped out of the DEF tank, e.g.

during repair work, it must not be returned to the tank. The purity of the fluid can no longer be guaranteed.

Impurities in DEF (e.g. due to other Impurities in DEF (e.g. due to other service products, cleaning agents or dust) lead to:
- increased emission values
- damage to the catalytic converter
- engine damage
- malfunctions in the BlueTEC exhaust gas aftertreatment system

    See also:

    Important safety notes
    WARNING Gasoline and diesel fuels are highly flammable and poisonous. They burn violently and can cause serious injury. Never allow sparks, flames or smoking materials near gasoline or diesel ...

    Destination or area of destination reached
    When you reach your destination, COMAND displays a checkered flag and route guidance is automatically ended. For certain points of interest (e.g. airports), the Destination Reached display is s ...

    Service for recovering a stolen vehicle
    If your vehicle has been stolen: Notify the police. The police will issue a numbered incident report. This number will be forwarded to the Mercedes-Benz Customer Assistance Center togethe ...