See also:

Important safety notes
WARNING Never switch off the engine while the vehicle is in motion. There is no brake boost for the service brake if the engine is not running. If the ignition is switched off, there is also ...

Additives
Only use DEF in accordance with ISO 22241. Do not use additives with DEF and do not dilute DEF with water. This may destroy the BlueTEC exhaust gas aftertreatment system. ...

A unique combination of driver-assistance systems
The 2011 CL-Class further enforces its position as an automotive masterwork and a technology platform with the most advanced assistance and protection systems. These highly perceptive assistants c ...