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:

    Towing the vehicle with the rear axle raised
    Only possible on vehicles without 4MATIC. When towing your vehicle with the rear axle raised, it is important that you observe the safety instructions (). The ignition must be switched off if y ...

    High-beam headlamps (halogen headlamps)/cornering lamps (Bi-Xenon headlamps)
    •► Switch off the lights. •► Open the hood. •► Turn housing cover 1 counter-clockwise and pull it out. •► Turn bulb holder 2 counter-clockwise and pull it out. •υ ...

    Prerequisite
    The SatRadio mode described below requires optional satellite radio equipment and a subscription to SIRIUS XM Satellite Radio Traffic Message Service. Further details on SatRadio are availabl ...