176Vehicle care
V=up to 240 km/hW=up to 270 km/h
Tyre pressureCheck the pressure of cold tyres at
least every 14 days and before any
long journey. Do not forget the spare
wheel. This also applies to vehicles
with tyre pressure monitoring system.
Use the valve cap key to make
unscrewing the valve caps easier.
The valve cap key is located on the
inside of the tank flap.
Tyre pressure 3 207.
The tyre pressure data refers to cold
tyres. It applies to summer and winter tyres.
Always inflate the spare tyre to the
pressure specified for full load.
The ECO tyre pressure serves to
achieve the smallest amount of fuel
consumption possible.
Incorrect tyre pressures will impair
safety, vehicle handling, comfort and
fuel economy and will increase tyre
wear.
The tyre pressure tables show all
possible tyre combinations 3 207.
For the tyres approved for your
vehicle, refer to the EEC Certificate of
Conformity provided with your vehicle or other national registration
documents.
The driver is responsible for correct
adjustment of tyre pressure.9 Warning
If the pressure is too low, this can
result in considerable tyre warm-
up and internal damage, leading to tread separation and even to tyre
blow-out at high speeds.
If the tyre pressure shall be reduced
or increased on a vehicle with tyre
pressure monitoring system, switch
off ignition.
Tyre pressure monitoring
system The tyre pressure monitoring system
checks the pressure of all four wheels
once per minute when vehicle speed
exceeds a certain limit.Caution
Tyre pressure monitoring system
warns only about low tyre pressure
condition and does not replace
regular tyre maintenance by the
driver.
All wheels must be equipped with pressure sensors and the tyres must
have the prescribed pressure. If
wheels without sensors are mounted,
the tyre pressure monitoring system
is not operational. Retrofitting of
sensors is possible.
Note
In countries where the tyre pressure monitoring system is legally
required, the use of wheels without
pressure sensors will invalidate the
vehicle type approval.
Vehicle care177
The current tyre pressures can be
shown in the menu item Tyres in the
Board Computer menu. Press the
BC button on the Infotainment system
and select the menu item.
The tyre pressure monitoring system
automatically detects the vehicle
load. A message appears on the
information display if inconsistent tyre
pressures are detected. In some
versions, the message is displayed in
abbreviated form.
For example, the following messages can be displayed:A graphic indicating the left rear tyre
is shown together with the current tyre
pressure; slight pressure deviation.
Reduce speed. Check tyre pressure at next opportunity with an
appropriate gauge and correct if
necessary.
On the Colour-Info-Display, this
message will appear in yellow.A graphic indicating the front left tyre is shown together with the current tyre
pressure; significant pressure
deviation or direct pressure loss.
Steer out of the flow of traffic as
quickly as possible without
endangering other vehicles. Stop and check the tyres. Mount the spare
wheel if necessary 3 182.
On the Colour-Info-Display, this
message will appear in red.
Acknowledgement of warnings 3 92,
3 94.
Vehicle messages 3 100.
178Vehicle care
If the tyre pressure is to be reduced orincreased, switch off the ignition. Tyre
pressures 3 176, 3 207.
External high-power radio equipment
could disrupt the tyre pressure
monitoring system.
The tyre pressure monitoring system
valve cores and sealing rings must be
replaced each time the tyres are
changed.
Temperature compensation
Tyre pressure depends on the
temperature of the tyre. During
driving, tyre temperature and
pressure increase.
The tyre pressure value shown in the
display is the actual tyre pressure.
Therefore it is important to check tyre pressure with cold tyres.
Tread depth
Check tread depth at regular
intervals.
Tyres should be replaced for safety
reasons at a tread depth of 2-3 mm
(4 mm for winter tyres).For safety reasons it is recommended that the tread depth of the tyres on
one axle should not vary by more than
2 mm.
The legally permissible minimum
tread depth (1.6 mm) has been
reached when the tread has worn
down as far as one of the tread wear
indicators (TWI). Their position is
indicated by markings on the
sidewall.
If there is more wear at the front than
the rear, swap round front wheels and
rear wheels. Ensure that the direction
of rotation of the wheels is the same
as before.
Tyres age, even if they are not used.
We recommend tyre replacement
every 6 years.
Changing tyre and wheel
size
If tyres of a different size than those
fitted at the factory are used, it may be necessary to reprogramme the
speedometer as well as the nominal tyre pressure and make other vehicle modifications.
After converting to a different tyre
size, have the label with tyre
pressures replaced.9 Warning
Use of unsuitable tyres or wheels
may lead to accidents and will
invalidate the vehicle type
approval.
If wheel rims of a different type are to
be installed, the wheel nuts may also
need to be changed. We recommend you consult your service partner.
Vehicle care179Wheel coversWheel covers and tyres that are
factory approved for the respective
vehicle and comply with all of the
relevant wheel and tyre combination
requirements must be used.
If the wheel covers and tyres used are
not factory approved, the tyres must
not have a rim protection ridge.
Wheel covers must not impair brake
cooling.9 Warning
Use of unsuitable tyres or wheel
covers could lead to sudden
pressure loss and thereby
accidents.
Tyre chains
Tyre chains are only permitted on the
front wheels.
They must be fitted to the tyres
symmetrically in order to achieve a
concentric fit.
Always use fine mesh chains that add no more than 15 mm to the tyre tread
and the inboard sides (including chain lock).
9 Warning
Damage may lead to tyre blowout.
Tyre chains are permitted only on
16 inch wheels. We recommend you consult your service partner.
If the use of tyre chains is required
after suffering a flat front tyre, fit the
temporary spare wheel on the rear
axle and transfer one of the rear
wheels to the front axle.General
The use of tyre chains is not permitted on the temporary spare wheel.
Tyre repair kit
Minor damage to the tyre tread or
sidewall can be repaired with the tyre
repair kit.
Do not remove foreign bodies from
the tyres.
Tyre damage exceeding 4 mm or that
is at the tyre's sidewall near the rim
cannot be repaired with the tyre repair kit.
In vehicles with a tyre repair kit, there may not be a jack and vehicle tool kit.
Vehicle tools 3 173.
Temporary spare wheel 3 185.
182Vehicle care
vehicle must not be driven. Seek
the assistance of a workshop.
12. To adjust tyre pressure, screw compressor air hose (arrowed)
directly onto tyre valve.
13. Turn the selector switch clockwise
to the air only position. Switch on
the compressor to inflate the tyre
with air only.
Note
The driving characteristic of the
repaired tyre is severely affected,
therefore have this tyre replaced.
If unusual noise is heard or the
compressor becomes hot, turn
compressor off for at least
30 minutes.
Note the expiry date of the kit. After
this date its sealing capability is no
longer guaranteed. Pay attention to
storage information on sealant
canister.
Replace the used sealant canister.
To remove sealant canister, release sealant filler hose and air hose, slide
canister out of housing and unscrew hose from canister. Dispose of thecanister as prescribed by applicable
laws.
The accessory adapter supplied can
be used to pump up other items
e.g. footballs, air mattresses,
inflatable dinghies etc. The adapter
is located on the underside of the
tyre repair kit.
Wheel changing Some vehicles are equipped with a
tyre repair kit instead of a spare wheel 3 179.
Vehicle care183
Make the following preparations and
observe the following information:
■ Park the vehicle on a level, firm and
non-slippery surface. The front wheels must be in the straight-ahead position.
■ Apply the electrical parking brake 3 137 and engage first gear,
reverse gear or P.
■ Remove the spare wheel 3 185.
■ Never change more than one wheel
at a time.
■ Block wheel diagonally opposite the wheel to be changed, by placing
wedge blocks or equivalent in front
and behind the wheel.
■ Use the jack only to change wheels
in case of puncture, not for
seasonal winter or summer tyre
changes.
■ Never exceed jack maximum working load (900 kg).
■ If the ground on which the vehicle is standing is soft, a solid board
(max. 1 cm thick) should be placed
under the jack.■ Do not raise the vehicle more than is necessary to change a wheel.
■ No people or animals may be in the
vehicle when it is jacked-up.
■ Never crawl under a jacked-up vehicle.
■ Do not start the engine when it is raised on the jack.
■ Clean wheel nuts and thread before
mounting the wheel.9 Warning
Do not grease wheel bolt, wheel
nut and wheel nut cone.
1. Pull off the wheel cover.
2. Install the wheel wrench ensuring that it locates securely and loosen
each wheel nut by one turn by
turning anticlockwise.
3. The location of front and rear jacking points is indicated by
notches on the bottom edge of the
vehicle, under the doors.
184Vehicle care
4. Before positioning the jack, set itto the necessary height by
rotating the eye by hand.
Position jack at the jacking point
located nearest to the wheel concerned so that the jack claw
spans the vertical base. Ensure
the jack is positioned correctly.
The jack base must be on the
ground directly below the jacking
point in a manner that prevents it
from slipping.5. Attach wheel wrench to eye of threaded rod and rotate wrench
clockwise to raise vehicle.
If this is not the case, carefully
lower the vehicle immediately and
reposition the jack. Raise the
vehicle until the wheel is just clear of the ground.
6. Unscrew wheel nuts completely and wipe clean with a cloth.
Do not grease the threads. Put
wheel nuts somewhere where the threads will not be soiled.
7. Change the wheel. Notes on spare wheel 3 185.
8. Screw on the wheel nuts and
tighten slightly by hand by turning
clockwise until wheel is held
against the hub.
9. Rotate wrench anticlockwise and lower vehicle to the ground.
10. Install the wheel wrench ensuring that it locates securely and tighten
each wheel nut in a crosswise
sequence. Tightening torque is
140 Nm.
11. Stow the replaced wheel 3 185
and the vehicle tools 3 173.
12. Check the tyre pressure of the installed tyre as soon as possible.
Vehicle care185
Have the defective tyre renewed and
replace temporary spare wheel with a
full specification wheel without delay.
Jacking position for lifting platform
Rear arm position of the lifting
platform centrically under the recess
of the sill.
Front arm position of the lifting
platform centrically under the recess
of the sill.
Spare wheel
Temporary spare wheel
Some vehicles are equipped with a
tyre repair kit instead of a spare
wheel.
The temporary spare wheel is
designed for use on your vehicle only.
If mounting a spare wheel which is
different from the other wheels, this
wheel might be classified as a
temporary spare wheel and the
corresponding speed limits apply,
even though no label indicates this.
Seek the assistance of a workshop to
check the applicable speed limit.
Use of the temporary spare wheel
could affect driveability, particularly if
using winter tyres. Have the defective
tyre renewed as soon as possible and
have the wheel balanced and fitted to the vehicle.Caution
The use of a spare wheel that issmaller than the other wheels or in
combination with winter tyres
could affect driveability. Have the defective tyre replaced as soon as
possible.