Engine oil
Vehicles with a diesel particle filter:
If the vehicle is mostly driven for short distances, it is possible that malfunctions may occur during the automatic cleaning of the diesel particle filter. This can lead to engine damage. Therefore, if you frequently drive short distances, make sure to drive on highways or inter-urban roads for 20 minutes at least every 310 miles (500 km).
See also:
Servicing the brakes
If the red brake warning lamp
lights up in
the instrument cluster and you hear a
warning tone while the engine is running,
the brake fluid level may be too low.
Observe additional warning me ...
Mercedes-Benz M-Class Owners Manual
...
Making adjustments in 1 mph (Canada: 1 km/h) increments
Briefly press the cruise control
lever to the
pressure point, up 1 for a higher speed or
down 2 for a lower speed.
The last speed stored is increased or
reduced. ...