normal driving conditions, the filter cleans it-
self. The particulate filter is cleaned automat-
ically without need for indication by the
warning lamp
. This may be noticed be-
cause the engine idle speed increases and
an odour may be detected.
If automatic filter purification cannot be car-
ried out (because only short trips are taken,
for example), soot will accumulate on the fil-
ter and the particulate filter warning lamp will
switch on.
Facilitate the automatic filter cleaning proc-
ess by driving in the following manner:
Drive for approximately 15 minutes at a
●
minimum speed of 60 km/h (37 mph) in 4th or
5th gear (automatic gearbox: S gear range).
Maintain the engine speed at approximate-
●
ly 2,000 rpm.
The rise in temperature causes the soot on
the filter to burn. On completion of the clean-
ing the warning lamp will switch off. If the
warning lamp does not switch off, go immedi-
ately to a specialised workshop to rectify the
problem.
268
Driving
Driving tips
Driving on flooded roads
To prevent damage to the vehicle when driv-
ing through water, for example, along a floo-
ded road, please observe the following:
The water should never come above the
●
lower edge of the bodywork.
Drive at pedestrian speed.
●
WARNING
After driving through water, mud, sludge,
etc., the braking effect can be delayed
slightly due to moisture build-up on the
discs and brake pads. Applying the brakes
carefully several times will remove the
moisture and restore the full braking effect.
CAUTION
Driving through flooded areas may se-
●
verely damage vehicle components such
as the engine, transmission, running gear or
electrical system.
Whenever driving through water, the
●
Start-Stop system* must be switched off
›››
page
270.
Note
Check the depth of the water before en-
●
tering the flooded zone.
Do not stop in the water, drive in reverse,
●
or stop the engine in any situation.
Note that vehicles travelling in the oppo-
●
site direction may splash water that could
exceed the maximum permitted water
height for your vehicle.
Avoid driving through salt water (corro-
●
sion).
Total traction (4Drive)
3 Valid for vehicles: 4Drive all-wheel drive
On four-wheel drive models, the engine pow-
er is distributed to all four wheels
General notes
On four-wheel drive vehicles, the engine
power is distributed to all four wheels. The
distribution of power is controlled automati-
cally according to your driving style and the
›››
road conditions. Also see
page
The four-wheel drive is specially designed to
complement the superior engine power. This
combination gives the vehicle exceptional
handling and performance capabilities, both
on normal roads and in more difficult condi-
tions, such as snow and ice. Even so (or per-
haps especially for this reason), it is important
to observe certain safety points
250.
›››
.