
136 Driving and operationSave energy – more kilometres
Please observe the running-in hints on the
previous page and the tips for energy
saving on the following pages.
Good, technically correct and economical
driving ensures maximum durability and
performance for your vehicle.
Overrun cut-off
The fuel supply is automatically cut off
during overrun, e.g. when the vehicle is
driven with a gear engaged but no throttle
application. Overrun cut-off is deactivated
if catalytic converter temperature is high.
Vehicles with turbocharged engine
3
Flow-generated noises may be audible if
the accelerator is released quickly on
account of air flow in the turbocharger.
Engine speed
Drive in a low engine speed range for each
gear as much as possible. Warming up
Allow the engine to wa
rm up while driving.
Do not warm it up by letting it ru n at idling
speed. Do not apply full throttle until the
engine has reached operating
temperature.
After a cold start, the manual transmission
automated 3 does not switch to higher
gears until the speed increases when it is in
automatic mode. This allows the catalytic
converter to reach th e temperature quickly
which is required for optimum emission
reduction.
Correct gear selection
Do not race your engine whilst in neutral or
with a low gear selected. Driving too fast in
individual gears as well as stop-and-go
traffic increases engine wear and fuel
consumption.
Change down
When decreasing speed, shift down into
the next lowest gear. Do not slip the clutch
with a high-revving engine. This is
especially important when hill climbing. Cooling fan
The cooling fan is controlled via a
thermoswitch and therefore only runs if
necessary.
The cooling fan automatically switches on
when the diesel particle filter is being
cleaned
3 depending on the engine.
Pedals
Do not place any objects in the foot well
which could slip under the pedals and
inhibit the pedal travel.
To ensure the pedal travel is uninhibited,
there must be no mats in the area of the
pedals.
Battery care
When driving slowly or when the vehicle is
stationary, e.g. in slow urban traffic, stop-
and-go traffic or traffic jams, turn off all
unnecessary electrical loads where
possible (e.g. heated rear window, heated
front seats, etc.).
Declutch when starting in order to relieve
the strain on the starter and the battery.

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.

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.

149
Driving and operation
Picture no: 7758u.tif
To activate Tap button I: the current speed is stored
and maintained. The accelerator pedal
can be released.
Vehicle speed can be increased by
depressing the accelerator pedal. When
the accelerator pedal is released, the
previously stored speed is resumed. Accelerate
With cruise control activated, hold down
button I or briefly press it repeatedly:
speed is increased continuously or in steps
of 2 km/h.
The current speed is stored and saved after
the I button has been released.
Decelerate
With cruise control active, hold down
button R or briefly press it repeatedly:
speed is reduced continuously or in steps
of 2 km/h.
The current speed is stored and saved after
the R button has been released. To deactivate
Briefly press the
O button: cruise control is
deactivated.
Automatic deactivation:
z vehicle speed below approx. 30 km/h
z the brake pedal is depressed
z the clutch pedal is depressed 3
z move the selector lever on the manual
transmission automated 3 to N
Stored speed
The speed is saved until the ignition is
switched off.
To resume the saved speed, briefly press
the R button at a speed above 30 km/h.

152 Driving and operationFor vehicles with manual transmission
automated 3, the control indicator flashes
for a few seconds when the ignition is
turned off when the hand brake is not
applied. Anti-lock brake system (ABS
u)
ABS prevents the wheels from locking.
ABS starts to regulate brake pressure as
soon as a wheel shows a tendency to lock.
The vehicle remains steerable, even during
hard braking.
ABS control is made apparent though a
pulse in the brake pedal and the noise of
the regulation process.
For optimum braking, keep the brake
pedal fully depresse d throughout the
braking process, despite the fact that the
pedal is pulsating. Do not reduce the
pressure on the pedal.
Picture no: 17895s.tif
Control indicator u for ABS
It illuminates for a few seconds when
ignition is switched on. Once the control
indicator goes out, the system is ready for
operation.
If the control indica tor does not go out
after a few seconds, or if it illuminates while
driving, there is a fault in the ABS. The
brake system remains operational without
ABS regulation.
Adaptive brake lamp 3
During full-on braking, all three brake
lamps flash for the duration of ABS control. Self testing
When the engine is started and the vehicle
starts off, the system performs a self-check,
which may be audible.
Fault
Have cause of fault remedied by a
workshop. The system’s integrated self
diagnostics allow faults to be quickly
remedied.
9 Warning
If there is a fault in the ABS, the wheels
may be liable to lock due to braking that
is heavier than normal. The advantages
of ABS are no longer available. During
hard braking, the vehicle can no longer
be steered and may swerve.

164 Driving and operationIf the trailer/caravan starts to sway, drive
more slowly, do not attempt to correct the
steering and brake sharply if necessary.
If it is necessary to apply the brakes fully,
depress the brake pedal as hard as
possible.
Remember that the braking distance for
vehicles towing carava ns/trailers with and
without brake is always greater than that
for vehicles not towing a caravan/trailer.
When driving downhill , drive in the same
gear as if driving uphill and drive at a
similar speed.
Adjust tyre pressure to the value specified
for full load 3228. Starting on inclines
For vehicles with ma
nual transmission,
the most favourable engine speed
when starting off on an incline is
between 2500 and 3000 rpm for petrol
engines and between 2000 and 2500 rpm
for diesel engines. Hold engine speed
constant, engage clutch gradually (let slip)
– release hand brake – and open throttle. If
possible, the engine speed should not drop
during this procedure.
For vehicles with ma nual transmission
automated 3 in Automatic mode simply
apply full gas. Before starting off under extreme
operating conditions, switch off
unnecessary consumers.

170 Self-help, vehicle careIf the automatic clutch has been manually
disengaged in vehicles with manual
automated transmission 3 towing is not
permitted 3134. In this case, contact a
workshop for assistance immediately.
After towing, unscrew towing eye by
rotating clockwise and insert and close the
cap.
Picture no: 14199s.tif
Towing another vehicle
Attach a tow rope 3 – or better still a tow
rod 3 – to the rear towing eye on the right
side of the vehicle underbody, but never to
the rear axle.
Picture no: 17898s.tif
On some versions, the towing eye is located
behind a cover.
Slacken the screw a quarter turn with a
screwdriver (see Fig.) and remove the
cover.
The towing eye may only be used for
towing and not for recovery of the vehicle.
After towing, fit cover 3 and secure with
bolt.
Caution
Drive slowly. Do not drive jerkily.
Excessive tractive force can damage the
vehicle.