High outside temperatures
If DEF heats up to over 122 °F (50 °C) for extended periods, e.g. as a result of direct sunlight on the DEF reservoir, DEF can decompose. Ammonia vapors develop as a result.
WARNING
When opening the filler cap of the DEF tank
ammonia gas vapors may escape. Refill DEF
in a well ventilated area only. Ammonia gas
vapors have a pungent odor and are
particularly irritating for your skin, mucous
membranes, and eyes. Inhaling ammonia gas
vapors will cause burning eyes, nose, and
throat, as well as coughing and watering eyes.
See also:
General notes
USA only:
This device complies with Part 15 of the
FCC Rules. Operation is subject to the
following two conditions:
1. This device may not cause harmful
interference, and
2. this device must ...
Calling up the compass
The compass shows which direction the
vehicle is currently traveling in: N, NE, E, SE,
S, SW, W or NW.
To obtain a correct display in rear-view
mirror 1, the compass must be calibrated
and ...
Styling
The 2012 M-Class retains many of the previous generation's styling cues, like
a wide front grille and forward-swept C-pillars, but the new design looks more
substantial and imposing. Contributing ...