See also:

Front fog lamps and rear fog lamp
Front fog lamps Only vehicles with front fog lamps have the "fog lamps" function. WARNING   If you suspect that driving conditions will be foggy, turn the light switch to b ...

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. ...

GTW (Gross Trailer Weight)
The GTW is the weight of a trailer including the weight of the load, luggage, accessories etc. on the trailer. ...