
139
Driving and operation
Fuels, refuellingFuel consumption
The fuel consumption is determined under
specified driving conditions 3224.
Special equipment increases the weight of
the vehicle. As a result, they can increase
fuel consumption and reduce the specified
maximum speed.
For the first few thousand kilometres,
friction between the engine and
transmission components is higher. This
increases fuel consumption. Fuel for petrol engines
Only use unleaded fuel that complies
with DIN EN 228.
Fuels with ethanol content greater than 5 %
may only be used if the vehicle has been
specifically developed and approved for
these fuels.
Use fuel with the recommended octane
rating (value in bold
3220). Use of fuel
with too low an octane rating can reduce
engine power and torque and will slightly
increase fuel consumption. Fuel for diesel engines
Only use diesel fuel that complies
with DIN EN 590. The fuel must have low
sulphur content (maximum 50 ppm).
Do not use marine diesel oils, heating oils
or entirely or partially plant-based diesel
fuels, such as rape seed oil or bio diesel,
Aquazole and similar diesel-water
emulsions. Diesel fuels must not be diluted
with fuels for petrol engines.
The flow and filterability of diesel fuel are
temperature-dependent. When
temperatures are low, re
fuel with diesel fuel
with guaranteed winter properties.
Caution
Use of fuel with too low an octane rating
could lead to uncontrolled combustion
and engine damage.

143
Driving and operation
Picture no: 17891s.tif
Control indicator
Z for exhaust
Illuminates when the ignition is switched on
and during the start attempt. Goes off
shortly after the engine starts running.
Illumination whilst the engine is running
indicates a fault in the emission control
system. The permissible emission limits
may be exceeded. Contact a workshop for
assistance immediately.
Illumination with the engine running
indicates a fault that can cause damage to
the catalytic converter. It is possible to
continue driving without causing damage
by slowing down until the flashing stops
and the control indicator illuminates.
Contact a workshop for assistance
immediately.
Picture no: 17880s.tif
Control indicator
A
for engine electronics
Illuminates for a few seconds after the
ignition is switched on.
If it illuminates when the engine is running,
there is a fault in engine or transmission
electronics. The electr onic system switches
to an emergency runni ng programme. Fuel
consumption may be increased and the
driveability of the vehicle may be impaired.
In some cases the fault can be remedied by
switching the engine off and starting it
again. If the control indicator continues to
illuminate whilst the en gine is running,
contact a workshop for assistance in
remedying the cause of the fault. If it illuminates briefly, but does not recur, it
is of no significance.
Lighting of
A may indicate water in the
diesel fuel filter 3. Have the fuel filter
checked for water residue 3212.
If it flashes after the ignition is switched on,
there is a fault in the immobiliser system.
The engine cannot be started 327.

147
Driving and operation
Control indicator
v
The warning light lights up for a few
seconds when ignition is switched on. Once
it goes out, the system is ready for
operation.
Flashing during driving:
This shows the system has come into
action. The engine output may be reduced
(the sound of the engine changes) and the
vehicle may be braked automatically to a
small degree.
Picture no: 17892s.tif
Illuminates while driving:
Fault in the system. Driving can be
continued. Poor road surface conditions
may however still cause vehicle stability to
be impaired.
Have the cause of the fault eliminated.
Self-diagnosis integrated into the system
allows rapid fault identification. Illuminates after interruption of power
supply e.g. after disconnecting battery.
After a power supply interruption the
steering angle sensor must be calibrated to
make the system operational:
z
Automatic calibration driving in straight
line at constant slow (20 to 40 km/h)
speed on level, dry road.
z Manual calibration by turning steering
wheel from limit position to limit position.
If the indicator lamp does not go off after
successful calibration , observe notes in
middle column.

148 Driving and operationCruise control 3
Cruise control can store and maintain
speeds of approx. 30 to 200 km/h.
Deviation from the stored speed is possible
on uphill or downhill inclines.
For safety reasons the cruise control
cannot be activated until the foot brake
has been operated once.
The cruise control is operated with the
buttons I, R and O on the turn signal lever.
Do not use the cruise control if it is not
advisable to maintain a constant speed
(e.g. in situations presenting a danger to
yourself and other road users, in heavy
traffic or on winding, slippery or greasy
roads). For manual transmission automated
3,
engage cruise control in automatic mode
only.
Picture no: 17893s.tif
Control indicator
m 3
The warning lamp lights up for a few
seconds 3 when the ignition is switched on.
The system is now ready for operation.
When driving, th e warning lamp m lights
up as soon as the sy stem is switched on.
9 Warning
When the cruise control is active,
reaction times may be increased due to
the different position of the feet.

153
Driving and operation
Picture no: 14723s.tif
Hand brake Always apply hand brake firmly without
pressing the release button, and apply as
firmly as possible on steep slopes.
To release the hand brake pull lever up
slightly, press release button, and lower
lever all the way down.
To reduce the operating forces of the hand
brake, depress the foot brake at the same
time.
Brake assist If the brake pedal is operated quickly with
a powerful push, the vehicle is
automatically braked at full braking power
in order to achieve the shortest possible
braking distance when full-on braking
occurs (brake assist).
Maintain steady pressure on the brake
pedal for as long as full-on braking is to
continue. When the brake pedal is
released, the maximum brake force
amplification is taken away. Hill Start Assist
3 (HSA)
The system helps pull away on inclines.
After releasing the footbrake, if the hand
brake is not applied the brakes are only
released after 2 seconds. As soon as the
acceleration is sufficient to prevent rolling
back, the brake is released.
Wheels, tyresSuitable tyres and restrictions 3 228.
Tyres fitted in the factory are adapted to
the chassis and provide optimum driving
comfort and safety.
Changing tyre/wheel type
If tyres of a different size than those fitted
at the factory are used, it may be
necessary to reprogram the electronic
speedometer and make other vehicle
modifications.
After converting to a different tyre size,
have the adhesive label with tyre pressures
replaced.
9 Warning
Use of unsuitable tyres or wheels may
lead to accidents and render the vehicle
unroadworthy.

162 Driving and operation
Picture no: 17923s.tif
Stowage of coupling ball bar
Place coupling ball bar in bag and clip onto
the tool kit below the spare wheel 3159,
Fig. 14195 S.
On vehicles with tyre repair kit 3, the
coupling ball bar is stored in the left
stowage compartment beneath the floor
cover in the luggage compartment - see
Fig. above.
Caravan/trailer towingCaravan and trailer loads
1)
The permissible caravan/trailer loads are
vehicle and engine-dependent maximum
values which must not be exceeded. The
actual caravan/trailer load is the difference
between the actual gross weight of the
caravan/trailer and the actual coupling
socket load with the caravan/trailer
coupled.
The permissible caravan/trailer loads are
specified in the vehi cle documents. In
general, they are valid for gradients up to
maximum 12% The permitted caravan/trailer load applies
up to the specified incline and up to an
altitude of 1000 metres above sea level.
Since engine power decreases as altitude
increases because of the air becoming
thinner, therefore reducing climbing ability,
the permitted towing weight also
decreases by 10 % for
every 1000 metres of
additional altitude. The towing weight
does not have to be reduced when driving
on roads with slight inclines (less than 8 %,
e.g. motorways).
The permissible gross train weight must not
be exceeded. This weig ht is specified on
the identification plate 3218. 1)Observe national regulations.

163
Driving and operation
Coupling socket load
The coupling socket load is the load
exerted by the trailer/caravan on the
coupling ball. It can be varied by changing
the weight distribution when loading the
trailer/caravan.
The maximum permissible coupling socket
load (55 kg) of the towing vehicle is
specified on the towing equipment
identification plate and in the vehicle
documents. This must always be complied
with, particularly in the case of heavy
caravans/trailers. The coupling socket load
should be no less than 25 kg.
When measuring the coupling socket load,
make sure that the drawbar of the loaded
trailer/caravan is at the same height as it
will be when the trailer/caravan is coupled
with the towing vehicle loaded. Particularly
important for trailers/caravans with
tandem axle. Rear axle load during towing
With the trailer connected and the towing
vehicle fully loaded including all
occupants, the permitted rear axle load
(specified on the identification plate and
vehicle documents) must be exceeded by
no more than 25 kg and the maximum
permitted gross vehicle weight by no more
than 30 kg. If the maximum permitted rear
axle load is exceeded, a maximum speed
of 100 km/h applies, and 80 km/h for
commercial vehicles.
Driving characteristics, towing tips
Before attaching th
e trailer/caravan,
lubricate the ball of the trailer/caravan
towing device. However, do not lubricate
the ball if a stabiliser, which acts on the
coupling ball, is being used to damp
hunting.
Check caravan/traile r lighting before
starting to drive. The fog tail lamps on the
vehicle are deactivated when towing a
caravan or trailer.
Trailers with LED turn signals must have a
provision enables lamp monitoring for
commercial bulbs.
Handling is greatly influenced by the
loading of the trailer/caravan. Loads
should therefore be secured so that they
cannot slip and be placed in the centre of
the trailer/caravan if possible, i.e. above
the axle.
In the case of trailers with low driving
stability, do not exceed a speed of 80 km/h;
the use of a friction-type stabiliser is
strongly recommended.

168 Self-help, vehicle careRoute the leads so that they cannot catch
on rotating parts in the engine
compartment.
To start the engine:
1. Start the engine of the vehicle providing the jump start.
2. After 5 minutes, start the other engine. Start attempts shou ld be made at
intervals of 1 minute not last longer
than 15 seconds.
3. Allow both engines to idle for approx. 3 minutes with the leads connected.
4. Switch on electrical consumers (e.g. light, heated rear window) of the vehicle
receiving the jump start.
5. Reverse above sequence exactly when removing leads.
Picture no: 17896s.tif
Towing Towing your own vehicle
Disengage cap at bottom and remove
downwards.
Picture no: 14198s.tif
The towing eye is in the tool kit 3 in the
luggage compartment underneath the
spare wheel 3, see Fig. above, or for
versions with tyre repair kit 3, in the
storage compartment underneath the floor
cover, see Fig. 17918 S.