See also:

Setting the B-pillar air vents
1 B-pillar air vent 2 Thumbwheel for B-pillar air vent To open/close: turn thumbwheel 2 to the left or right. ...

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. ...

Interior
The M-Class seats five people on front buckets and a three-place split rear seat that folds to expand cargo space to 81.2 cubic feet. An optional two-place third-row seat increases passenger capac ...