156Vehicle care
If the cooling system is cold, the
coolant level should be between the
MIN and MAX marks. Top up if the
level is low.
9 Warning
Allow the engine to cool before
opening the cap. Carefully open
the cap, relieving the pressure
slowly.
To top up use a 1:1 mixture of
released coolant concentrate mixed
with clean tap water. If no coolant
concentrate is available, use clean
tap water. Install the cap tightly. Have
the coolant concentration checked
and have the cause of the coolant
loss remedied by a workshop.
Engine coolant temperature control
indicator W 3 88.
Power steering fluidCaution
Extremely small amounts of
contamination can cause steering
system damage and cause it to not work properly. Do not allow
contaminates to contact the fluid
side of the reservoir cap/dipstick or
from entering the reservoir.
Open the cap and remove. Wipe the
dipstick dry and turn the cap in the
container. Open the cap again and
read the power steering fluid level.
The power steering fluid level must be between the MIN/COLD and the
MAX /HOT marks.
If the fluid level is too low, seek the
assistance of a workshop.
Vehicle care157Washer fluid
Fill with clean water mixed with a
suitable quantity of washer fluid which
contains antifreeze. For the correct mixing ratio refer to the washer fluid
container.
Caution
Only washer fluid with a sufficient
antifreeze concentration provides
protection at low temperatures or
a sudden drop in temperature.
Do not spray washer fluid onto
windscreen in freezing weather, to avoid ice forming and impairing
vision.
In cold weather, do not fill the washer
fluid reservoir more than three
quarters full, to allow enough room for expansion if the fluid freezes, and to
prevent damage to the reservoir.
Brakes In the event of minimum thickness of
the brake lining, a squealing noise
sounds during braking.
Continued driving is possible but
have the brake lining replaced as
soon as possible.
Once new brake linings are installed,
do not brake unnecessarily hard for
the first few journeys.Brake fluid9 Warning
Brake fluid is poisonous and
corrosive. Avoid contact with eyes, skin, fabrics and painted surfaces.
The brake fluid level must be betweenthe MIN and MAX marks.
When topping up, ensure maximum cleanliness as contamination of the
brake fluid can lead to brake system
malfunctions. Have the cause of the
loss of brake fluid remedied by a
workshop.
158Vehicle careCaution
Only use high-performance brake
fluid approved for the vehicle.
Brake fluid 3 198.
Brake fluid level control indicator R
3 85.
Clutch fluid
9 Warning
Clutch fluid is poisonous and
corrosive. Avoid contact with eyes, skin, fabrics and painted surfaces.
If the fluid in the reservoir falls below
the MIN mark, seek the assistance of
a workshop.
Clutch fluid 3 198.
Vehicle battery Vehicles without stop-start system
will be equipped with a lead acid
battery. Vehicles with stop-start
system will be equipped with an
AGM vehicle battery which is not a
lead acid battery.
The vehicle battery is maintenance-
free provided that the driving profile
allows sufficient charging of the
battery. Short-distance-driving and
frequent engine starts can discharge
the vehicle battery. Avoid the use of
unnecessary electrical consumers.
Batteries do not belong in household
waste. They must be disposed of at
an appropriate recycling collection
point.
Laying up the vehicle for more than
6 weeks can lead to battery
discharge. Disconnect the clamp from the negative terminal of the vehicle
battery.
Ensure the ignition is switched off
before connecting or disconnecting
the vehicle battery.
The anti-theft alarm siren must be
deactivated as follows: Switch the ignition on then off, disconnect the
vehicle's battery within 15 seconds.
160Vehicle care
Charging the vehicle battery9Warning
On vehicles with stop-start
system, ensure that the charging potential does not exceed
14.6 volts when using a battery
charger. Otherwise the vehicle
battery might be damaged.
Jump starting 3 190.
Warning label
Meaning of symbols: ■ No sparks, naked flames or smoking.
■ Always shield eyes. Explosive gases can cause blindness or
injury.
■ Keep the vehicle battery out of reach of children.
■ The vehicle battery contains sulfuric acid which could cause
blindness or serious burn injuries.
■ See the Owner's Manual for further
information.
■ Explosive gas may be present in the vicinity of the vehicle battery.Diesel fuel filter
Drain diesel fuel filter of residual
water at every engine oil change.
Place a container underneath the
filter housing. Turn drain plug
anticlockwise using a suitable
screwdriver, to drain off the water.
The filter is drained as soon as diesel fuel emerges from the port. Retighten
the drain plug by turning it clockwise.
With engine switched off, turn ignition
key to ON, wait approx. 5 seconds,
and turn key to LOCK to perform
priming operation. Perform this
178Vehicle care
V=up to 150 mphW=up to 168 mph
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 3 210.
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.
Tyre pressures differ depending on
various options. For the correct tyre
pressure value, follow the procedure
below:
1. Identify the engine identifier code.
Engine data 3 205.
2. Identify the respective tyre.
The tyre pressure tables show all
possible tyre combinations 3 210.
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 must 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.
180Vehicle care
For example, the following messagescan 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 3 186.
On the Colour-Info-Display, this
message will appear in red.
Acknowledgement of warnings 3 92,
3 95.
Vehicle messages 3 100.
If the tyre pressure is to be reduced or
increased, switch off the ignition. Tyre
pressures 3 178, 3 210.
Temperature dependency Tyre pressure depends on the
temperature of the tyre. During
driving, tyre temperature and
pressure increase.
The tyre pressure value shown in the Info-Display is the actual tyre
pressure. Therefore it is important to
check tyre pressure with cold tyres.
General information
The use of commercially available
liquid tyre repair kits can impair the
function of the system. Factory-
approved tyre repair kits can be used.
Tyre repair kit 3 183.
External high-power radio equipment
could disrupt the TPMS.
The tyre pressure monitoring system
valve cores and sealing rings must be
replaced each time the tyres are
changed.
Vehicle care181
TPMS sensor matching process
Each TPMS sensor has a unique
identification code. The identification
code must be matched to a new tyre/ wheel position after rotating the tyres
or replacing one or more of the TPMS
sensors.
The TPMS sensor matching process
should also be performed after
replacing a spare tyre with a road tyre containing a TPMS sensor. The
control indicator w and the warning
message should extinguish at the
next ignition cycle.
The sensors are matched to the tyre/
wheel positions, using a TPMS
relearn tool, in the following order:
■ left front tyre
■ right front tyre
■ right rear tyre
■ left rear tyre
Consult your workshop for service or
to purchase a relearn tool.
There are two minutes to match the
first tyre/wheel position, and
five minutes overall to match all fourtyre/wheel positions. If it takes longer,
the matching process stops and must be restarted.
The TPMS sensor matching process
is as follows:
1. Apply the electrical parking brake 3 137 ; on vehicles with automatic
transmission move the selector
lever to position P.
2. Turn the ignition on 3 124.
3. Initiate the TPMS Learn Mode by simultaneously pressing buttons
p and q on the radio remote
control,
- or -
Press the INFO button on the
Infotainment system until a tyre
learn message appears on the
Info-display. Press and hold the
OK button.
The horn sounds twice and the left front turn signal also illuminates
as confirmation that Learn Mode
has been enabled.
4. Start with the left front tyre.5. Place the relearn tool against the tyre sidewall, near the valve stem.Then press the button to activatethe TPMS sensor. A horn chirp
confirms that the sensor
identification code has been
matched to this tyre and wheel
position. The next relevant turn
signal illuminates.
6. Proceed to the right front tyre, and
repeat the procedure in Step 5.
7. Proceed to the right rear tyre, and
repeat the procedure in Step 5.
8. Proceed to the left rear tyre, and repeat the procedure in Step 5.
The horn sounds twice to indicate
the sensor identification code has been matched, and the TPMS
sensor matching process is no
longer active.
9. Turn off the ignition.
10. Set all four tyres to the recommended inflation pressure
3 210.
182Vehicle careTread 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 a workshop.
Wheel covers Wheel 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.