Low outside temperatures
DEF freezes at a temperature of approximately 12 °F (–11 °C). The vehicle is equipped with a DEF preheating system when it leaves the factory. Winter operation is therefore also guaranteed at temperatures below 12 °F (–11 °C).
See also:
Safety
The R-Class received a Good overall score — the highest rating possible — in
the Insurance Institute for Highway Safety's frontal-offset and side-impact
crash tests. It hadn't yet undergone IIHS' ...
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 wo ...
M+S tires
At temperatures below 45 °F (+7
°C), use
winter tires or all-season tires. Both types of
tire are identified by the M+S marking.
Only winter tires bearing the
snowflake
symbol in addition t ...