Setting the side air vents
•► To open/close: turn thumbwheel 3 up or down.
Side window defroster vent 1 is never completely shut, even if side air vent 2 is shut.
See also:
Additives
Do not use any additives in the engine oil.
This could damage the engine. ...
2011 Mercedes-Benz GL-Class Review
Let's face it: If you're smitten by Mercedes' GL-Class full-size SUV, the
recent run-up in prices at the pump probably rates somewhere between
insignificant and unimportant in your car search. Wit ...
Switching the windshield wipers on/
off
WARNING
Wiper blades are components that are subject
to wear and tear. Replace the wiper blades
twice a year, preferably in the spring and fall.
Otherwise the windshield will not be wiped
...