2008 MERCEDES-BENZ CLS COUPE Owners Manual

Refuelling
190 Running-in notes
The first 1,500 km
If you treat the engine with sufficient care
from the very start, it will reward you with
excellent performance for a very long period
afterwards.
R You should therefore drive at varying road
and engine speeds for the first 1,500 km
.
R Avoid heavy loads, e.g. driving at full throt-
tle, during this time. Do not exceed 2
/ 3 of
the maximum permissible engine speed for
each gear.
R Change gear in good time.
R Do not shift down a gear manually in order
to brake.
R Try to avoid depressing the accelerator
pedal beyond the pressure point (kick-
down).
R Only use ranges 3, 2 or 1 for slow driving,
e.g. in mountainous terrain.
After 1,500 km you may gradually bring the
vehicle up to full road and engine speeds.
Additional driving tips for AMG vehicles: R
Do not drive faster than
140 km/h for the
first 1,500 km.
R Only bring the engine up to a maximum
speed of 4,500 rpm for a brief period.
i You should also observe these notes if the
engine or rear axle transmission on your
vehicle has been replaced. AMG vehicles with a rear axle differ-
ential lock*
Your vehicle is equipped with a self-locking
differential

on the rear axle. To better protect
the differential gear on the rear axle, you
should perform an oil change after a running-
in phase of 3,000 km. This oil change will
increase the service life of your differential.
Have the oil change performed at a qualified
specialist workshop. Mercedes-Benz recom-
mends that you use a Mercedes-Benz Service
Centre for this purpose. Refuelling
Refuelling
G
Risk of explosion
Fuel is highly flammable. Fire, naked flames
and
smoking are therefore prohibited when
handling fuels.
Before refuelling, turn off the engine and
the auxiliary heating*. G
Risk of injury
Avoid any contact with fuels.
You can damage your health if your skin
comes

into direct contact with fuel or if you
inhale the vapour. G
Risk of fire
Do not use petrol to refuel vehicles with a
diesel
engine. Never mix diesel with petrol.
This would damage the fuel system and
engine and could result in a vehicle fire.
! Do not use petrol to refuel vehicles with a
diesel engine. Do not use diesel to refuel
vehicles with a petrol engine. Even small
amounts of the wrong fuel will damage the
injection system. Damage resulting from
adding the wrong fuel is not covered by the
warranty. Operation
* optional
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Refuelling
191
!
Do not start the engine if you accidentally
refuel with the wrong fuel. Otherwise, you
risk engine damage. Consult a specialised
qualified workshop and have the fuel sys-
tem emptied completely.
When you open or close the vehicle with the
key or KEYLESS GO*, the fuel filler flap is
automatically unlocked or locked.
The fuel filler flap is to the rear on the right.1 To open the fuel filler flap
2 To insert the fuel cap
3 Tyre pressure table
4 Fuel type X
To open: press the fuel filler flap in the
direction of arrow 1.
The fuel filler flap opens slightly.
X Open the fuel filler flap.
X Turn the fuel filler cap to the left and
remove it.
X Insert the fuel filler cap into the holder
bracket on the inside of filler flap 2.
X Only fill the tank until the pump nozzle
switches off.
! Overfilling the tank could damage the fuel
system.
X To close: replace the fuel filler cap and turn
it clockwise. The fuel filler cap audibly
engages.
X Close the fuel filler flap.
i Vehicles with a diesel engine:
If you have run the tank completely dry, it
will be necessary to bleed the fuel system
(Y page 254).
Petrol (EN 228)
! Refuel using only unleaded premium
grade petrol with a minimum octane num-
ber of 95 RON/85 MON conforming to
European standard EN 228.
You could otherwise impair engine output
or damage the engine.
You will find further information about pet-
rol under "Fuel" in the index.
i As a temporary measure, but only when
the recommended fuel is not available, you
may also use regular unleaded petrol,
91 RON/82.5 MON. This may reduce per-
formance and increase petrol consump-
tion. Avoid driving at full throttle.
In some countries, the available petrol qual-
ity may not be sufficient and could cause
coking around the inlet valve. In such
cases, and in consultation with a
Mercedes-Benz Service Centre, the petrol
may be mixed with the additive recommen-
ded by Mercedes-Benz (part no.
A000989254510). You must observe the
notes and mixing ratios given on the con-
tainer.
Operation
* optional
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Refuelling
192
CLS 350 CGI !
Refuel using only unleaded premium
grade petrol with a minimum octane num-
ber of 95 RON/85 MON conforming to
European standard EN 228.
You could otherwise impair engine output
or damage the engine.
You
will find further information about pet-
rol under "Technical data" in the index.
i In some countries, only petrol of insuffi-
cient quality (high-sulphur fuel) may be
available. This fuel can temporarily produce
unpleasant odours, especially on short
journeys. Refuelling with petrol of sufficient
quality (sulphur-free fuel) will reduce such
odours.
AMG vehicles !
Refuel using only super unleaded petrol
with a minimum octane number of 98
RON/88 MON conforming to European
standard EN 228.
You could otherwise impair engine output
or damage the engine.
You

will find further information about pet-
rol under "Technical data" in the index. i
If the recommended fuel is not available
and

only as a temporary measure, you may
also use premium unleaded petrol,
95 RON/85 MON. This may reduce per-
formance and increase petrol consump-
tion. You must avoid driving at full throttle.
! In emergencies, only when the recom-
mended fuel is not available, you may also
use standard unleaded petrol, 91 RON/
82.5 MON. However, using this fuel results
in considerably higher petrol consumption
and significantly reduced performance.
Avoid driving at full throttle, and only drive
in drive program C.
If no fuel other than regular petrol fuel 91
RON/82.5 MON or a lower grade is per-
manently available, you should have the
vehicle adapted to run on this fuel by the
local after-sales service. Diesel (EN 590)
! Only use diesel that complies with the
EN 590 European standard.
You could otherwise impair engine output
or damage the engine.
You will find further information about die-
sel under "Fuel" in the index.
! When
refuelling vehicles with a diesel par-
ticle filter in countries outside the EU, only
low-sulphur Euro diesel with less than
0.005 percent sulphur content by weight
should be used. In countries in which diesel
with a higher sulphur content is available
(e.g. 0.035 percent by weight), the engine
oil should be renewed at more frequent
intervals. More information about intervals
for changing the engine oil can be obtained
from any Mercedes-Benz Service Centre.
! Using fuel that does not comply with EN
590 can increase wear and damage the
engine and the exhaust system. Do not use
the following:
R Marine diesel
R Heating oil
R Bio-diesel Operation
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Engine compartment
193
R
Vegetable oil
R Petrol
R Petroleum
R Kerosene
Do
not add such fuels to diesel fuel and do
not use any special additives (exception:
flow improvers – see "Low outside temper-
atures").
Damage caused by the use of unapproved
fuels or additives is not covered by the war-
ranty.
Low outside temperatures The flow properties of diesel may be insuffi-
cient at low ambient temperatures.
To prevent operating problems, diesel fuel
with improved cold flow qualities is available
during the winter months. Your vehicle must
be

refuelled with this winter diesel at temper-
atures of -5 °C or below.
You can use this winter diesel at tempera-
tures down to about -20 °C without problems.
If only summer diesel fuel or less cold-resist-
ant winter diesel fuel (e.g. in Mediterranean
regions) is available, you should add an
amount of flow improver to the fuel corre-
sponding to the outside temperature. Mix the additive with the diesel in good time,
before the flow properties of the diesel
become

insufficient. Otherwise, malfunctions
can only be rectified by heating the entire fuel
system, e.g. by parking the vehicle in a heated
garage. G
Risk of fire
Do not use petrol to refuel vehicles with a
diesel
engine. Never mix diesel with petrol.
This would damage the fuel system and
engine and could result in a vehicle fire.
Flow improver
The effectiveness of a flow improver is not
guaranteed with every fuel. Observe the infor-
mation provided by the manufacturer when
using a flow improver. Only use flow improv-
ers that have been tested and approved by
Mercedes-Benz. Information about flow
improvers that have been tested and
approved by Mercedes-Benz can be obtained
from any Mercedes-Benz Service Centre. Engine compartment
Bonnet
G
Risk of accident
Do not pull the release lever while the vehi-
cle is in motion. The bonnet could other-
wise open.
Opening G
Risk of injury
There is a risk of injury if the bonnet is open,
even if the engine is not running.
Some engine components can become
very hot.
To

avoid the risk of burns, only touch those
components described in the Owner’s Man-
ual and observe the relevant safety notes. G
Risk of injury
The radiator fan between the radiator and
the engine can start automatically, even if
the

key has been removed from the ignition
lock. For this reason you must not reach
into the turning area of the fan. You could
otherwise sustain an injury.
Vehicles with a petrol engine: Operation
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Engine compartment
194 The electronic ignition system uses high
voltage. For this reason you must never
touch components of the ignition system
(ignition coil, ignition cable, spark plug con-
nector or test socket) when:
R
the engine is running
R the engine is being started
R the ignition is switched on and the engine
is being cranked by hand
Vehicles with a diesel engine:
The electronic injection control uses high
voltage. Therefore, never touch fuel injec-
tion system components when:
R the engine is running
R the engine is being started
R the ignition is switched on
X Make sure that the windscreen wipers are
switched off. G
Risk of injury
The windscreen wipers and wiper rods
could be set in motion.
When the bonnet is open, you or others
could be injured by the wiper rods. Make sure that the windscreen wipers are
switched off and that the key has been
pulled out of the ignition lock before open-
ing the bonnet.
The bonnet release lever is located in the
driver's footwell.1 Bonnet release lever
X Pull release lever 1.
The bonnet is released.
! Make sure that the windscreen wipers
are not folded away from the windscreen.
You could otherwise damage the wind-
screen wipers or the bonnet. The handle for opening the bonnet is located
above the radiator grille.
2
Bonnet catch handle
X Reach into the gap, pull bonnet catch han-
dle 2 up and lift the bonnet.
Closing
G Risk of injury
Make sure that nobody can become trap-
ped as you close the bonnet.
X Lower the bonnet and let it fall from a
height of approximately 20 cm. The bonnet
engages into place.
Operation
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Engine compartment
195Engine oil
Depending on how it is driven, the vehicle
consumes a maximum of 0.8 l oil per 1,000
km. The oil consumption may be higher than
this when the vehicle is new or if you fre-
quently drive at high engine speeds. You can
only estimate the oil consumption after you
have driven a considerable distance.
You will find further information about engine
oil in the "Technical data" section
(Y page 314).
Checking the engine oil level To do so:
R
the vehicle should be parked on level
ground
R the engine should be switched off for at
least five minutes if the engine was at nor-
mal operating temperature
R the engine should be switched off for at
least 30 minutes if the engine was not at
operating temperature (i.e. if you only star-
ted the engine briefly) Using the oil dipstick
Example of a vehicle with a petrol engine (CLS 350)
1
Oil dipstick
2 Upper mark
3 Lower mark
X Pull oil dipstick 1 out of the oil dipstick
tube.
X Wipe off oil dipstick 1.
X Insert oil dipstick 1 into the oil dipstick
tube to the stop, and take it out again.
The oil level is correct if the level is between
lower mark 3 and upper mark 2.
X Top up the oil if necessary ( Y page 195).i
The difference in quantity between lower
mark 3 and upper mark 2 is approxi-
mately 2 litres.
Topping up the engine oil Example of a vehicle with a petrol engine (CLS 350)
1
Cover Operation
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Engine compartment
196Example of a vehicle with a diesel engine (CLS 320
CDI)
1
Cover
X Unscrew cap 1 and remove it.
X Top up by the amount of oil required.
! Do not add too much oil. If too much oil
is added, there is a risk of damage to the
engine or the catalytic converter.
X Screw cap 1 onto the filler neck.
H Environmental note
When topping up the oil, take care not to
spill any. Oil must not be allowed to escape
into the soil or waterways. You would oth-
erwise be damaging the environment.
Coolant
G Risk of injury
The cooling system is pressurised. There-
fore, only unscrew the cap once the engine
has cooled down. The coolant temperature
gauge must display less than 70°C. You
could otherwise be scalded by escaping hot
coolant.
Coolant consists of water and antifreeze/cor-
rosion inhibitor. Only check the coolant level
when the vehicle is on a level surface and the
engine has cooled down. Checking the coolant levelThe expansion tank is located in the engine
compartment on the left when viewed in the
direction of travel.
1
Cover
2 Expansion tank
3 Marker bar
X Slowly turn cap 1 by half a turn anti-clock-
wise to allow excess pressure to escape.
X Turn cap 1 further anti-clockwise and
remove it.
There is sufficient coolant in expansion
tank 2 if the coolant is level with marker
bar 3 in the filler neck when cold or
approximately 1.5 cm higher when hot.
Operation
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Engine compartment
197
X
Top up the coolant if necessary.
X Replace cap 1 and tighten all the way to
the stop.
You will find further information about coolant
in the "Technical data" section
(Y page 316). Windscreen washer system/head-
lamp cleaning system*
The washer fluid reservoir is located in the
engine compartment on the right when
viewed in the direction of travel. The head-
lamp cleaning system* is also supplied from
the washer fluid reservoir.1 Cover X
Add windscreen washer concentrate to the
washer fluid all year round.
G Risk of fire
Windscreen washer concentrate is highly
flammable. Fire, naked flames and smoking
are prohibited when windscreen washer
concentrate is being handled.
Use
R a windscreen washer fluid additive
such as MB Summerwash to prevent
smearing (for temperatures above freez-
ing).
R a windscreen washer fluid additive with
antifreeze properties such as MB Winter-
wash (if there is a risk of frost).
X Mix the windscreen washer fluid in a con-
tainer beforehand. Adapt the mixing ratio
to the outside temperatures.
! Only use windscreen washer fluid which
is suitable for plastic lamp lenses. Unsuit-
able windscreen washer fluid could dam-
age the plastic lamp lenses of the head-
lamps. X
To open: pull cap 1 upwards by the tab.
X To close: press cap 1 onto the filler neck
until it clicks into place.
Operation
* optional
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