See also:

Removing the mechanical key
Push release catch 1 in the direction of the arrow and at the same time, remove mechanical key 2 from the SmartKey. ...

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. ...

Removing the towing eye
Loosen the towing eye and unscrew it. Attach cover 1 to the bumper and press until it engages. Place the towing eye in the vehicle tool kit. ...