See also:

Activating/deactivating
WARNING Any accumulation of snow and ice should be removed from the rear window before driving. Visibility could otherwise be impaired, endangering you and others. The rear window defroster h ...

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 ...

R350 Bluetec in the Market
One look at Mercedes' 2010 sales numbers is all you need to understand the R-Class' niche status. In a year when the automaker's midsize M-Class and full-size GL-Class SUVs sold around 30,000 and ...