See 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. ...

Socket in the rear-compartment centerconsole
► Lift up the cover of socket 1. ...

Storing the ball coupling
WARNING Do not carry the ball coupling in the vehicle interior if it is not secured. Otherwise, you and others could be injured by the ball coupling being thrown around if you: - brake sharply ...