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:

    Infrared light (Night View Assist Plus)
    •► Switch off the lights. •► Open the hood. •► Turn housing cover 1 counter-clockwise and pull it out. •► Turn bulb 2 counter-clockwise and pull it out. •► Inse ...

    Tire pressure of cold tires
    The tires are cold: • if the vehicle has been parked without direct sunlight on the tires for at least three hours and • if the vehicle has not been driven more than 1 mile (1.6 km). ...

    Important safety notes
    WARNING If the vehicle becomes trapped in snow, ensure that snow is kept away from the exhaust pipe and from around the vehicle as long as the engine is running. Otherwise, poisonous carb ...