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:

    PSI (pounds per square inch)
    A standard unit of measure for tire pressure. ...

    "Electronic crumple zone": even more safety in the M-Class
    As ever, the best accident is one which does not happen at all. The safety engineers at the Mercedes Technology Center are working intensively on this rather simple sounding statement, which in pr ...

    Precise wheel location: the front axle with McPherson struts
    At the front axle a three-link construction with McPherson struts is used. The lower link level consists of two separate elements which act as torque and cross struts and which are both forged fro ...