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:

    Washing by hand
    Carefully remove all deposits of road salt as soon as possible when driving in winter. Also, clean the insides of the wheels when washing the underbody of the vehicle. ► Do not use hot wat ...

    Opening and closing
    Overhead control panel 1 To raise 2 To open 3 To close - Turn the SmartKey to position 1 or 2 in the ignition lock. - Press or pull the switch in the corresponding direction. If you ...

    General notes
    In this menu, you can set the following vehicle functions: • ECO • multicontour seat settings • rear window blind • EASY-ENTRY/EXIT feature • exterior lighting delayed switch-off • i ...