
Opening (automatically from
outside) ............................................ 80
Overview .......................................... 79
Trunk lid
Display message ............................ 239
Opening/closing .............................. 79
Opening dimensions ......................353
Trunk load (maximum) ......................353
Trunk partition Display message ............................ 239
General notes .................................. 88
Opening/closing .............................. 88
Turn signals
Changing bulbs (front) ...................115
Display message ............................ 222
Switching on/off ........................... 108
Type identification plate
see Vehicle identification plate U
Unlocking Emergency unlocking .......................78
From inside the vehicle (central
unlocking button) ............................. 77V
Vanity mirror (in the sun visor) ........260
Vehicle Correct use ...................................... 23
Data acquisition ............................... 24
Display message ............................ 237
Equipment ....................................... 20
Individua lsettings .......................... 203
Limited Warranty ............................. 24
Loading .......................................... 319
Locking (in an emergency) ...............78
Locking (SmartKey) .......................... 71
Lowering ........................................ 334
Maintenance .................................... 21
Parking for a long period ................ 158
Pulling away ................................... 138
Raising ........................................... 331
Reporting problems .........................24
Securing from rolling away ............331
Towing away .................................. 301
Tow-starting ................................... 301Transporting
.................................. 303
Unlocking (in an emergency) ...........78
Unlocking (SmartKey) ......................71
Vehicle data ................................... 353
Vehicle battery
see Battery (vehicle)
Vehicle data ....................................... 353
Vehicle dimensions ...........................353
Vehicle emergency locking ................78
Vehicle identification number see VIN
Vehicle identification plate ..............347
Vehicle tool kit .................................. 291
Video Operating the DVD ......................... 200
VIN ...................................................... 347 W
Warning and indicator lamps ABS ................................................ 244
Brakes ........................................... 244
Check Engine ................................. 250
Coolant .......................................... 250
Distance warning ........................... 252
DISTRONI CPLUS ........................... 252
ESP ®
.............................................. 246
ESP ®
OFF ....................................... 247
Fuel tank ........................................ 250
Overview .......................................... 30
PASSENGER AIR BAG OFF
indicator lamp .................................. 45
Reserve fuel ................................... 250
Seat bel t........................................ 242
SPORT handling mode ...................247
SRS ................................................ 249
Tire pressure monitor ....................253
Warning triangle ................................ 290
Warranty ............................................ 346
Washer fluid Display message ............................ 240
Wheel bol ttightening torque ...........334
Wheel chock ...................................... 331
Wheels Changing awheel .......................... 329
Checking ........................................ 309
Cleaning ......................................... 284
Cleaning (warning) .........................33018
Index 

0006
Locking
X Turn the mechanical key clockwise as far
as it will go to position 0006.
X Turn the mechanical key back and remove
it.
X Make sure that the doors and the trunk lid
are locked.
X Insert the mechanical key into the
SmartKey.
i If you lock the vehicle as described above,
the fuel filler flap is not locked. The anti-
theft alarm system is not armed. Trunk
Important safety notes
G
WARNING
When leaving the vehicle, always remove the
SmartKey from the ignition lock. Always take
the SmartKey with you and lock the vehicle.
Do not leave childre nunsupervised in the
vehicle, eve nifthey are secured in a child
restraint system, and do not give them access
to an unlocked vehicle. Achild's unsupervised
access to a vehicle could result in an accident
and/or serious personal injury. They could:
R injure themselves on vehicle parts
R be seriously or fatally injured by extreme
heat or cold
R injure themselves or have an accident with
vehicle equipment that may still be in
operation even after the SmartKey has
been removed from the ignition, such as the seat adjustment, steering wheel
adjustment or memory function.
If children open a door, they could cause
severe or even fatal injury to other persons; if
they get out of the vehicle, they could injure
themselves when doing so or be seriously or
even fatally injured by any passing traffic.
Do not expose the child restraint system to
direct sunlight. The child restraint system's
metal parts, for example, could become very
hot, and a child could be burned on these
parts. G
WARNING
Do not carry heavy or hard objects in the
passenger compartmentort runk unless they
are firmly secured in place.
Unsecured or improperly positioned cargo
increases a child's risk of injury in the event
of
R strong braking maneuvers
R sudden changes of direction
R an accident G
WARNING
Make sure the trunk lid is closed when the
engine is running and while driving. Among
other dangers, deadly carbon monoxide (CO)
gases may enter the vehicle interior resulting
in unconsciousness and death.
! The trunk lid swings upwards when
opened .Therefore, make sure that there is
sufficient clearance above the trunk lid.
i Opening dimensions of the trunk lid
(Y page 353).
Do not leave the SmartKey in the trunk. You
could otherwise lock yourself out.
The trunk lid can be:
R opened and closed from outside
R opened automatically from outside
R locked separately
R unlocked with the mechanical key
R opened with the emergency release button Trunk
79Opening/closing Z 

Opening/closing from outside
Opening X
Press the 0010button on the SmartKey.
X Pull handle 0003.
X Raise the trun klid.
Closing G
WARNING
To prevent possible personal injury, always
keep hands and fingers away fro mthe trunk
opening when closing the trunk lid. Be
especially careful when small children are
around. X
Pull the trunk lid down using recess 0003.
X Lock the vehicle if necessary with
the 000F button on the SmartKey or with
KEYLESS-GO.
i If a KEYLESS-GO key is detected in the
trunk, the trunk lid cannot be locked and
then opens again. Opening automatically from the
outside
Important safety notes G
WARNING
Make sure the trunk lid is closed when the
engine is running and while driving. Among
other dangers, deadly carbon monoxide (CO)
gases may enter the vehicle interior resulting
in unconsciousness and death.
! The trunk lid swings upwards when
opened. Therefore, make sure that there is
sufficient clearance above the trunk lid.
i Opening dimensions of the trunk lid
(Y page 353).
Opening You can open the trunk lid automatically
using the SmartKey or the handle in the trunk
lid.
X
Press and hold the 0006button on the
SmartKey until the trunk lid opens.
or
X If the trunk lid is unlocked, pull the trunk lid
handle and let it go again immediately. Locking the trunk separately
You can lock the trunk separately.Ify ou then
unlock the vehicle centrally, the trunk
remains locked and cannot be opened.
X Close the trunk lid.
X Take the mechanical key out of the
SmartKey (Y page 72).80
TrunkOpening/closing 

Useful information
i This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please note that your vehicle may
not be equipped with all features
described. This also applies to safety-
related systems and functions.
i Read the information on qualified
specialist workshops: (Y page 23).Important safety notes
G
WARNING
If wheels and tires of the wrong size are used,
the wheel brakes or suspension components
may be damaged. There is arisk of accident.
Always replace wheels and tires with those
that fulfill the specifications of the original
part (designation, manufacturer, model). G
WARNING
Af lat tire severely impairs the driving,
steering and braking characteristics of the
vehicle. There is a risk of accident.
Tires without run-flat characteristics:
R do not drive with aflat tire.
R immediately replace the flat tire with your
emergency spare wheel or spare wheel, or
consult a qualified specialist workshop.
Tires with run-flat characteristics:
R pay attention to the information and
warning notices on MOExtended tires (tires
with run-flat characteristics).
Accessories that are not approved for your
vehicle by Mercedes-Ben zorare not being
used correctly can impair the operating
safety. Before purchasing and using non-approved
accessories, visit a qualified specialist
workshop and inquire about:
R
suitability
R legal stipulations
R factory recommendations
Information on dimensions and types of
wheels and tires for yourv ehicle can be found
(Y page 335).
Information on air pressure for the tires on
your vehicle can be found:
R on the vehicle's Tire and Loading
Information placard on the B-pillar
R on the tire pressure label on the fuel filler
flap
R under "tire pressure" Operation
Information on driving
If the vehicle is heavily laden, chec kthe tire
pressures and correct them if necessary.
While driving, pay attention to vibrations,
noises and unusual handling characteristics,
e.g. pulling to one side. This may indicate that
the wheels or tires are damaged. If you
suspect that a tire is defective, reduce your
speed immediately. Stop the vehicle as soon
as possible to check the wheels and tires for
damage. Hidden tire damage could also be
causing the unusual handling characteristics.
If you find no signs of damage, have the tires
and wheels checked at a qualified specialist
workshop.
When parking your vehicle, make sure that
the tires do not get deformed by the curb or
other obstacles. If it is necessary to drive over
curbs, speed humps or similar elevations, try
to do so slowly and at an obtuse angle.
Otherwise, the tires, particularly the
sidewalls, may be damaged. 308
OperationWheels and tires 

Follow recommended tire inflation pressures
and check the pressure of all the tires
including the spare wheel:
R
monthly, at least
R if the load changes
R before beginning a long journey
R under different operating conditions, e.g.
off-road driving
If necessary, correct the tire pressure.
i The specifications on the sample Tire and
Loading Information placard and tire
pressure tables are examples. Tire
pressure specifications are vehicle-specific
and may deviate from the data show nhere.
The tire pressure specifications that are
valid for your vehicle can be found on the
Tire and Loading Information placard and
tire pressure table on the vehicle.
General notes The recommended tire pressures for the tires
mounted at the factory can be found on the
labels described here.
Operation with the emergency spare
wheel(Y page 339).
Further information on tire pressures can be
obtained at a qualified specialist workshop.
Tire and Loading Information placard 0003
Recommended tire pressures
The Tire and Loading Information placard is
on the B-pillar on the driver's side
(Y page 319). The Tire and Loading Information placard
contains the recommended tire pressures for
cold tires. The recommended tire pressures
are valid for the maximum permissible load
and up to the maximum permissible vehicle
speed.
Tire pressure table
The tire pressure table is on the inside of the
fuel filler flap.
Example: tire pressure table for all tires permitted
for this vehicle by the factory
The tire pressure table contains the
recommended pressures for cold tires for
various operating conditions, i.e. differing
load and speed conditions. Example: tire pressure table with tire dimensions
If a tire size precedes a tire pressure, the tire
pressure information following is only valid
for that tire size. The load conditions "partially
laden" and "fully laden" are defined in the
table for differen
tnumbers of occupants and
amounts of luggage. The actual number of
seats may differ. 312
Tire pressureWheels and ti
res 

Aspect ratio
Relationship between tire height and tire
width in percent.
Tire pressure
This is pressure inside the tire applying an
outward force to each square inch of the tire's
surface .The tire pressure is specified in
pounds per square inch (psi), in kilopascal
(kPa) or in bar. The tire pressure should only
be corrected when the tires are cold.
Cold tire pressure
The tires are cold:
R if the vehicle has been parked without
direct sunlight on the tires for at least three
hours and
R if the vehicle has been driven for less than
1 mile (1.6 km).
Tread
The part of the tire that comes into contact
with the road.
Bead
The tire bead ensures that the tire sits
securely on the wheel. There are several steel
wires in the bead to prevent the tire from
coming loose from the wheel rim.
Sidewall
The part of the tire between the tread and the
bead.
Weight of optional extras
The combined weight of those optional extras
that weigh more than the replaced standard
parts and more than 2.3 kilograms (5 lbs).
These optional extras, such as high-
performance brakes, level control, a roof rack
or a high-performance battery, are not
included in the curb weight and the weight of
the accessories.
TIN (Tire Identification Number)
This is a unique identifier which can be used
by a tire manufacturer to identify tires, for
example for a product recall, and thus identify the purchasers. The TIN is made up of the
manufacturer's identity code, tire size, tire
type code and the manufacturing date.
Load bearing index
The load bearing index (also load index) is a
code that contains the maximum load bearing
capacity of a tire.
Traction
Traction is the result of friction between the
tires and the road surface.
Treadwear indicators
Narrow bars (tread wear bars) that are
distributed over the tire tread. If the tire tread
is level with the bars, the wear limit of
0009in
(1.6 mm) has been reached.
Occupant distribution
The distribution of occupants in a vehicle at
their designated seating positions.
Total load limit
Rated cargo and luggage load plus
68 kilograms (150 lb) multiplied by the
number of seats in the vehicle. Changing
awheel Flat tire
Information on the procedure in the event of
a fla ttire (Y page 291). Instructions for driving
with MOExtended tires in the event of a flat
tire are also provided there. Interchanging the wheels
G
WARNING
Interchanging the front and rear wheels may
severely impair the drivin gcharacteristics if
the wheels or tires have different dimensions.
The wheel brakes or suspension components
may also be damaged. There is a risk of
accident. Changing
awheel
329Wheels and tires
Z 

Rotate fron
tand rea rwheels only if the wheels
and tires are of the same dimensions.
! On vehicles equipped with a tire pressure
monitor, electronic components are
located in the wheel.
Tire-mounting tools should not be used
near the valve. This could damage the
electronic components.
Only have tires changed at a qualified
specialist workshop.
! On vehicles equipped with a tire pressure
monitor, electronic components are
located in the wheel.
Tire-mounting tools should not be used
near the valve. This could damage the
electronic components.
Only have tires changed at a qualified
specialist workshop.
Always pay attention to the instructions and
safety notes when changing a wheel
(Y page 330).
The wear patterns on the front and rear tires
differ, depending on the operating conditions.
Rotate the wheels before a clear wear pattern
has formed on the tires. Front tires typically
wear more on the shoulders and the rear tires
in the center.
If your vehicle's tire configuration allows, you
can rotate the wheels according to the
intervals in the tire manufacturer's warranty
book in your vehicle documents. If this is not
available, the tires should then be replaced
every 3,000 to 6,000 miles (5,000 to
10,000 km), or earlier if the tire wear requires
this. Do not change the direction of wheel
rotation.
Cleant he contact surfaces of the wheel and
the brake disc thoroughly every time a wheel
is interchanged. Check the tire pressure and,
if necessary, restart the tire pressure loss
warning system or the tire pressure monitor. Direction of rotation
Tires with a specified direction of rotation
have additional benefits, e.g. if there is a risk
of hydroplaning. You will only gain these
benefits if the correct direction of rotation is
maintained.
An arrow on the sidewall of the tire indicates
its correct direction of rotation. Storing wheels
Store wheels that are not being used in a cool,
dry and preferably dark place. Protect the
tires from oil, grease, gasoline and diesel. Cleaning the wheels
G
WARNING
The water jet from a circular jet nozzle (dirt
blasters) can cause invisible exterior damage
to the tires or chassis components.
Components damaged in this way may fail
unexpectedly. There is a risk of an accident.
Do not use power washers with circular jet
nozzles to clean the vehicle. Have damaged
tires or chassis components replaced
immediately. Mounting
awheel
Preparing the vehicle X
Park the vehicle on firm, non-slippery and
level ground.
X Apply the electric parking brake manually.
X Bring the front wheels into the straight-
ahead position.
X Vehicles with manual transmission:
shift to first gear or reverse gear.
X Vehicles with automatic transmission:
move the selector leve rtoP.
X Switch off the engine.
X Vehicles without KEYLESS-GO: remove
the SmartKey from the ignition lock. 330
Changing
awheelWheels and tires 

SLK 55 AMG
Summer tires
R18
Tires Alloyw
heels FA: 235/40 ZR18 95 Y XL
RA: 255/35 ZR18 94 Y XL
4 FA: 8.0 J x 18 H2
Wheel offset: 1.69 in (43 mm)
RA: 9.0 J x 18 H2
Wheel offset: 1.65 in (42 mm)
Winter tires
R18
Tires Alloy wheels
BA: 235/40 R18 95 V XL M+S
0004 BA: 8.0 J x 18 H2
Wheel offset: 1.69 in (43 mm)
FA: 235/40 R18 95 V XL M+S
0004
RA: 255/35 R18 94 V XL M+S 00044 FA: 8.0 J x 18 H2
Wheel offset: 1.69 in (43 mm)
RA: 9.0 J x 18 H2
Wheel offset: 1.65 in (42 mm)
Emergency spare wheel
Important safety notes
G
WARNING
The wheel or tire size as well as the tire type
of the spare wheel or emergency spare wheel
and the wheel to be replaced may differ.
Mounting an emergency spare wheel may
severely impair the driving characteristics.
There is a risk of an accident.
To avoid hazardous situations:
R adapt you rdriving style accordingly and
drive carefully.
R never mount more than one spare wheel or
emergency spare wheel that differs in size.
R only use a spare wheel or emergency spare
wheel of a different size briefly. R
do not switch ESP ®
off.
R have a spare wheel or emergency spare
wheel of a different size replaced at the
nearest qualified specialist workshop.
Observe that the wheel and tire dimensions
as well as the tire type must be correct.
When using an emergency spare wheel or
spare wheel of a different size, you must not
exceed the maximum speed of 50 mph
(80 km/h).
Snow chains must not be mounted on
emergency spare wheels. General notes
You should regularly check the pressure of
the emergency spare wheel, particularly prior
to long trips, and correct the pressure as
necessary (Y page 311). The applicable value
4 Use of snow chains is not permitted .Observe the notes in the "Snow chains" section. Emergency spare wheel
339Wheels and tires Z