
154Driving and operating
higher fuel consumption and
CO 2 emission levels and a lower
maximum speed.Trailer hitch
General information
Only use towing equipment that has
been approved for your vehicle.
Entrust retrofitting of towing
equipment to a workshop. It may be
necessary to make changes that
affect the cooling system, heat
shields or other equipment.
Do not mount towing equipment to
vehicles with Z 20 LEH engine.
Fitting of towing equipment could
cover the opening of the towing eye.
If this is the case, use the coupling ball bar for towing. Always keep the
coupling ball bar in the vehicle.
Installation dimensions of factory-
fitted towing equipment 3 232.Driving characteristics and
towing tips Before attaching a trailer, lubricate
the coupling ball. However, do not do
so if a stabiliser, which acts on the
coupling ball, is being used to reduce snaking movements.
For trailers with low driving stability
and trailers with a permitted gross
vehicle weight of more than 1300 kg
(Saloon) /1200 kg (Station wagon) a
speed of 80 km/h must not be
exceeded; the use of a stabiliser is
recommended.
If the trailer starts snaking, drive more
slowly, do not attempt to correct the
steering and brake sharply if
necessary.
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 3 225.

Vehicle care159Vehicle careGeneral Information...................159
Vehicle checks ........................... 160
Bulb replacement .......................166
Electrical system ........................181
Vehicle tools .............................. 187
Wheels and tyres .......................188
Jump starting ............................. 200
Towing ....................................... 201
Appearance care .......................203General Information
Accessories and vehicle
modifications
We recommend using genuine parts and accessories and factory
approved parts specific for your
vehicle type. We cannot assess or guarantee reliability of other products
- even if they have a regulatory or
otherwise granted approval.
Do not make any modifications to the electrical system, e.g. changes of
electronic control units (chip tuning).Caution
When transporting the vehicle on
a train or on a recovery vehicle, the
mud flaps might be damaged.
Vehicle storage
Storage for a long period of time
The following must be done if the
vehicle should be stored for several months:
■ Wash and wax the vehicle.
■ Have the wax in the engine compartment and underbody
checked.
■ Clean and preserve rubber seals.
■ Fill up fuel tank completely.
■ Change engine oil.
■ Drain washer fluid reservoir.
■ Check coolant antifreeze.
■ Adjust tyre pressure to the value specified for full load.
■ Park vehicle in dry, well ventilated place. Engage first or reverse gear
or set selector lever to P. Prevent
the vehicle from rolling.
■ Do not apply parking brake.

Vehicle care165
■ The vehicle battery containssulphuric 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 system
bleeding
If the tank has been run dry, the diesel
fuel system must be bled. Switch on
the ignition three times for
15 seconds at a time. Then crank the
engine for a maximum of 40 seconds. Repeat this process after
no less than 5 seconds. If the engine
fails to start, seek the assistance of a
workshop.Wiper blade replacement
Service setting for front
windscreen wipers
Switch off the ignition but do not
remove ignition key or open driver's
door.
Within 4 seconds, push the wiper
lever down and release as soon as
the wipers are vertical.
Wiper blades on the windscreen
Lift the wiper arm, tilt wiper blade at a
90° to the wiper arm and remove to
the side.

Vehicle care183
Fuse assignments inconjunction with loadcompartment fuse box version ANo.Circuit1ABS2ABS3Interior fan climate control
system4Interior fan, heating, air condi‐
tioning system5Radiator fan6Radiator fan7Central locking system8Windscreen washer system,
tailgate9Heated rear window, heated
exterior mirror10Diagnostics plug11InstrumentsNo.Circuit12Mobile telephone, Infotainment
system, display13Courtesy light14Windscreen wiper15Windscreen wiper16Horn, ABS, brake light switch,
air conditioning system17Diesel fuel filter or air condi‐
tioning system18Starter19–20Horn21Engine electronics22Engine electronics23Headlight range adjustment24Fuel pump25–26Engine electronicsNo.Circuit27Heating, air conditioning system28–29Power steering30Engine electronics31Rear window wiper32Brake light switch33Headlight range adjustment,
light switch, clutch switch,
instrument, driver's door
module34Control unit, steering column
module35Infotainment system36Cigarette lighter, front power
outlet

184Vehicle care
Fuse assignments inconjunction with load
compartment fuse box version BNo.Circuit1ABS2ABS3Interior fan electronic climate control4Interior fan heating and air
conditioning system5Radiator fan6Radiator fan7Windscreen washer system8Horn9Headlight washer system10–11–12–13Fog lightNo.Circuit14Windscreen wiper15Windscreen wiper16Control module electronics,
Open&Start system, ABS,
brake light switch, TwinTop17Diesel fuel filter heating18Starter19Transmission electronics20Air conditioning system21Engine electronics22Engine electronics23Adaptive forward lighting, head‐
light range adjustment24Fuel pump25Transmission electronics26Engine electronics27Power steering28Transmission electronicsNo.Circuit29Transmission electronics30Engine electronics31Adaptive forward fighting, head‐ light range adjustment32Brake system, air conditioning
system, clutch switch33Adaptive forward lighting, head‐
light range adjustment, light
switch34Control unit, steering column
module35Infotainment system36Mobile telephone, Infotainment
system, display

190Vehicle careTyre designationsE.g. 195/65 R 15 91 H195=Tyre width, mm65=Cross-section ratio (tyre
height to tyre width), %R=Belt type: RadialRF=Type: RunFlat15=Wheel diameter, inches91=Load index e.g. 91 is
equivalent to 618 kgH=Speed code letter
Speed code letter:
Q=up to 160 km/hS=up to 180 km/hT=up to 190 km/hH=up to 210 km/hV=up to 240 km/hW=up to 270 km/h
Tyre pressure
Check 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.
Remove the valve cap key from the
fuel filler flap and use it to unscrew the
valve cap.
On vehicles with tyre pressure
monitoring system, screw the adapter
to the valve.
Tyre pressure 3 225 and on the label
on the inside of the fuel filler flap.
The tyre pressure data refer to cold
tyres. It applies to summer and winter tyres.
Always inflate the spare wheel to the
pressure specified for full load.
The ECO tyre pressure serves to
achieve the smallest amount of fuel
consumption possible. It must not be used with run-flat tyres.
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 drive axle and body style.
2. Identify the engine identifier code.
Engine data 3 216.
3. Identify the respective tyre.

204Vehicle care
If using a car wash, comply with the
car wash manufacturer's instructions. The windscreen wipers and rear
window wiper must be switched off.
Remove antenna and external
accessories such as roof racks etc.
If you wash your vehicle by hand,
make sure that the insides of the
wheel housings are also thoroughly
rinsed out.
Clean edges and folds on opened
doors and the bonnet as well as the
areas they cover.Caution
Always use a cleaning agent with
a pH value of 4 to 9.
Do not use cleaning agents on hot surfaces.
Do not clean the engine compartmentwith a steam-jet or high-pressure jet
cleaner.
Thoroughly rinse and leather-off the vehicle. Rinse leather frequently. Use
separate leathers for painted and
glass surfaces: remnants of wax on
the windows will impair vision.
Do not use hard objects to remove
spots of tar. Use tar removal spray on
painted surfaces.
Exterior lights
Headlight and other light covers are
made of plastic. Do not use any
abrasive or caustic agents, do not use an ice scraper, and do not clean them
dry.
Polishing and waxing Wax the vehicle regularly (at the
latest when water no longer beads).
Otherwise, the paintwork will dry out.
Polishing is necessary only if the paint
has become dull or if solid deposits
have become attached to it.
Paintwork polish with silicone forms a
protective film, making waxing
unnecessary.
Plastic body parts must not be treated with wax or polishing agents.Windows and windscreen wiper
blades
Use a soft lint-free cloth or chamois
leather together with window cleaner and insect remover.
When cleaning the rear window from
inside, always wipe in parallel to the
heating element to prevent damage.
For mechanical removal of ice, use a
sharp-edged ice scraper. Press the
scraper firmly against the glass so
that no dirt can get under it and
scratch the glass.
Clean smearing wiper blades with a
soft cloth and window cleaner.
Sun roof Never clean with solvents or abrasive
agents, fuels, aggressive media
(e.g. paint cleaner, acetone-
containing solutions etc.), acidic or
highly alkaline media or abrasive
pads. Do not apply wax or polishing
agents to the middle part of the sun
roof.

Service and maintenance209
aging control, whereas viscosity
grade gives information on the oil's
thickness over a temperature range.
Dexos is the newest engine oil quality
that provides optimum protection for
gasoline and diesel engines. If it is unavailable, engine oils of other listed qualities have to be used.
Recommendations for gasoline
engines are also valid for
Compressed Natural Gas (CNG),
Liquified Petroleum Gas (LPG) and
Ethanol (E85) fuelled engines.
Select the appropriate engine oil
based on its quality and on the
minimum ambient temperature
3 213.
Topping up engine oil
Engine oils of different manufacturers and brands can be mixed as long as
they comply with the required engine oil quality and viscosity.
Use of engine oil with only
ACEA A1/B1 or only A5/B5 quality is
prohibited, since it can cause long-
term engine damage under certain
operating conditions.Select the appropriate engine oil
based on its quality and on the
minimum ambient temperature
3 213.
Additional engine oil additives
The use of additional engine oil
additives could cause damage and
invalidate the warranty.
Engine oil viscosity grades
The SAE viscosity grade gives
information of the thickness of the oil.
Multigrade oil is indicated by two
figures, e.g. SAE 5W-30. The first
figure, followed by a W, indicates the
low temperature viscosity and the
second figure the high temperature viscosity.
Select the appropriate viscosity grade
depending on the minimum ambient
temperature 3 213.
All of the recommended viscosity
grades are suitable for high ambient
temperatures.Coolant and antifreeze
Use only silicate-free long life coolant
(LLC) antifreeze.
The system is factory filled with
coolant designed for excellent
corrosion protection and frost
protection down to approx. -28 °C.
This concentration should be
maintained all year round. The use of additional coolant additives that
intend to give additional corrosion
protection or seal against minor leaks
can cause function problems. Liability
for consequences resulting from the
use of additional coolant additives will be rejected.
Brake and clutch fluid Only use high-performance brake
fluid approved for the vehicle, consult a workshop.
Over time, brake fluid absorbs
moisture which will reduce braking
effectiveness. The brake fluid should therefore be replaced at the specified
interval.