
Contents
At the gas station ..............................  291
Refueling ......................................  291
Check regularly and before a
long trip........................................  292
Engine compartment .........................  294
Hood ............................................  294
Engine oil .....................................  296
Transmission fluid level* ..............  300
Coolant level ................................  300
Windshield washer system and 
headlamp cleaning system* .........  301
Battery .........................................  302
Tires and wheels ................................  304
Important guidelines ....................  304
Tire care and maintenance...........  305
Direction of rotation .....................  307
Loading the vehicle ......................  307
Recommended tire inflation
pressure .......................................  311
Checking tire inflation pressure ...  313
MOExtended system* ..................  321
Tire labeling..................................  321
Load identification .......................  325
DOT, Tire Identification
Number (TIN) ...............................  326
Maximum tire load .......................  327Maximum tire inflation pressure ... 328
Uniform Tire Quality Grading
Standards (U.S. vehicles) .............. 328
Tire ply material ............................ 330
Tire and loading terminology......... 331
Rotating tires ................................ 334
Winter driving ..................................... 335
Winter tires ................................... 335
Snow chains.................................. 336
Maintenance....................................... 337
Maintenance service indicator 
message ....................................... 337
Clearing the maintenance
service indicator message ............ 338
Maintenance service term
exceeded ...................................... 338
Calling up the maintenance
service indicator display ............... 338
Resetting the maintenance
service indicator ........................... 339
Vehicle care........................................ 340
Cleaning and care of vehicle ......... 340
Practical hints..................................  347
What to do if … ...................................  348
Lamps in instrument cluster .........  348
Lamp in center console ................ 358
Vehicle status messages in the 
multifunction display ....................  360
Where will I find...? .............................  389
First aid kit....................................  389
Vehicle tool kit, vehicle jack ......... 389
Spare wheel with collapsible tire ..  392
Spare wheel bolts .........................  393
Unlocking/locking in an emergency ..  394
Unlocking the vehicle ...................  394
Locking the vehicle .......................  395
Manually unlocking the gear
selector lever 
(automatic transmission*) ............  396
Opening/closing in an emergency .....  397
Raising retractable hardtop
manually .......................................  397
Replacing SmartKey batteries ............  398
Replacing bulbs ..................................  400
Bulbs.............................................  400
Replacing bulbs for front lamps ....  403
Replacing bulbs for rear lamps .....  404 

Contents
Replacing wiper blades ......................  406
Placing wiper arms in vertical
position ........................................  406
Removing wiper blades ................  407
Installing wiper blades..................  407
Flat tire ..............................................  408
Preparing the vehicle....................  408
Sealing tires with TIREFIT .............  408
Mounting the spare wheel ............  414
MOExtended system*...................  421
Battery ...............................................  422
Disconnecting the battery ............  423
Removing the battery ...................  424
Charging and reinstalling battery .  424
Reconnecting the battery .............  425
Jump starting .....................................  426
Towing the vehicle .............................  428
Installing towing eye bolt..............  429
Fuses .................................................  432
Fuse box in passenger
compartment................................  433
Fuse box in engine
compartment................................  433
Technical data.................................  435
Parts service ......................................  436
Warranty coverage.............................  437
Loss of Service and Warranty 
Information Booklet .....................  437
Identification labels ...........................  438
Layout of poly-V-belt drive .................  440
SLK 280, SLK 350 ........................  440
SLK 55 AMG.................................  440
Engine................................................  441
Rims and tires....................................  442
Same size tires .............................  443
Mixed size tires ............................  445
Spare wheel .................................  447
Electrical system ...............................  448
Main Dimensions ...............................  449
Weights..............................................  450Fuels, coolants, lubricants, etc. .........  451
Capacities ....................................  451
Engine oils ...................................  453
Engine oil additives ......................  453
Air conditioning refrigerant ..........  453
Brake fluid....................................  454
Premium unleaded gasoline .........  454
Fuel requirements ........................  455
Gasoline additives ........................  455
Coolants ......................................  456
Windshield washer system and 
headlamp cleaning system*.........  458
Index.................................................  459 

23 At a glance
Exterior view
ItemPage
1Trunk
Opening the trunk99
Closing the trunk100
Spare wheel392
Vehicle tool kit389
2Rear lamps400
3Rear window defroster170
4Fuel filler flap291
Refueling291
Gasoline454
5Doors
Locking and unlocking94
Opening98
Locking/unlocking in an 
emergency394
ItemPage
6Towing428
Installing towing eye bolt429
7Tires and wheels304
Checking tire inflation 
pressure313
General information304
Flat tire408
8Front lamps400
9Hood
Opening294
Engine oil296,
453
Coolant300,
456
ItemPage
aWindshield wipers56
Wiper blades, replacing406
Wiper blades, cleaning343
bWindshield
Cleaning with wiper fluid58
Cleaning343
cRetractable hardtop240
Opening/closing242
Wind screen246
Luggage cover241
dExterior rear view mirrors
Adjusting46
Auto-dimming rear view 
mirrors*168 

33 At a glance
Storage compartments
ItemPage
1Glove box253
2Door pocket
3Trunk
Vehicle tool kit, jack, spare 
wheel389
Luggage cover241
Trunk load450
Load limit309
4Door pocket
5Cupholder255
ItemPage
6Parcel net in passenger 
footwell254
7Ashtray255
Cigarette lighter256
8Storage tray
9Storage/telephone* 
compartment253
aStorage compartment 
between seat backrests254 

88 Safety and Security
Driving safety systems
Electronic traction system
The electronic traction system is a 
component of ESP
®.
The electronic traction system improves 
the vehicle’s ability to utilize available 
traction, especially under slippery road 
conditions by applying the brakes to a 
spinning wheel.
When you switch off the ESP
®, the 
electronic traction system is still enabled.Switching off the ESP
®
To improve the vehicle’s traction, turn off 
the ESP® in driving situations where it 
would be advantageous to have the drive 
wheels spin and thus cut into surfaces for 
better grip such as:
when driving with snow chains
in deep snow
in sand or gravelWhen you switch off the ESP
®
the ESP® does not stabilize the vehicle
the engine output is not limited, which 
allows the drive wheels to spin and 
thus cut into surfaces for a better grip
the traction control will still apply the 
brakes to a spinning wheel
the ESP® continues to operate when 
you are braking
you cannot activate the cruise control
the cruise control switches off if 
currently activated
Warning!G
If you are driving too fast, the electronic 
traction system cannot reduce the risk of an 
accident. 
The electronic traction system cannot pre-
vent the natural laws of physics from acting 
on the vehicle.
Warning!G
The ESP® should not be switched off during 
normal driving other than in the circum-
stances described below. Disabling of the 
system will reduce vehicle stability in stan-
dard driving maneuvers.
Do not switch off the ESP
® when a spare 
wheel is mounted.
Warning!G
Switch on the ESP® immediately if the afore-
mentioned circumstances do not apply any-
more. Otherwise the ESP
® will not stabilize 
the vehicle when it is starting to skid or a 
wheel is spinning. 

305 Operation
Tires and wheels
Tire care and maintenance
Regularly check your tire inflation pressure 
at least once a month. For more informa-
tion on checking tire inflation pressure, 
see “Recommended tire inflation pres-
sure” (
page 311).Tire inspection
Every time you check your tire inflation 
pressure, you should also inspect your 
tires for the following:
excessive treadwear (page 306)
cord or fabric showing through the 
tire’s rubber
bumps, bulges, cuts, cracks or splits in 
the tread or side of the tire
Replace the tire if you find any of the above 
conditions.
Make sure you also inspect the spare tire 
periodically for condition and inflation. 
Spare tires will age and become worn over 
time even if never used, and thus should be 
inspected and replaced when necessary.Life of tire
The service life of a tire is dependent upon 
varying factors including but not limited to:
Driving style
Tire inflation pressure
Distance driven
Warning!G
Regularly check the tires for damage. 
Damaged tires can cause tire inflation 
pressure loss. As a result, you could lose 
control of your vehicle.
Worn, old tires can cause accidents. If the 
tire tread is badly worn, or if the tires have 
sustained damage, replace them.
Warning!G
Tires and spare tire should be replaced after 
6 years, regardless of the remaining tread. 

307 Operation
Tires and wheels
Direction of rotation
Unidirectional tires offer added advan-
tages, such as better hydroplaning perfor-
mance. To benefit, however, you must 
make sure the tires rotate in the direction 
specified.
An arrow on the sidewall indicates the 
intended direction of rotation (spinning) of 
the tire.Loading the vehicle
Two labels on your vehicle show how much 
weight it may properly carry. 
1) The Tire and Loading Information 
placard can be found on the driver’s 
door B-pillar. This placard tells you im-
portant information about the number 
of people that can be in the vehicle and 
the total weight that can be carried in 
the vehicle. It also contains information 
on the proper size and recommended 
tire inflation pressures for the original 
equipment tires on your vehicle.
2) The certification label, also found on 
the driver’s door B-pillar. It tells you 
about the gross weight capacity of your 
vehicle, called the Gross Vehicle 
Weight Rating (GVWR). The GVWR 
includes the weight of the vehicle, all 
occupants, fuel and cargo. The certifi-
cation label also tells you about the 
front and rear axle weight capacity, 
called the Gross Axle Weight Rating 
(GAWR). The GAWR is the total allow-able weight that can be carried by a 
single axle (front or rear). Never exceed 
the GVWR or GAWR for either the front 
axle or rear axle.
1Driver’s door B-pillar
Following is a discussion on how to work 
with the information contained on the Tire 
and Loading Information placard with 
regards to loading your vehicle.
iSpare wheels may be mounted against the 
direction of rotation (spinning) even with a unidi-
rectional tire for temporary use only until the reg-
ular drive wheel has been repaired or replaced. 
Always observe and follow applicable temporary 
use restrictions and speed limitations indicated 
on the spare wheel. 

315 Operation
Tires and wheels
Run Flat Indicator* (Canada only)
While the vehicle is being driven, the Run 
Flat Indicator monitors the set tire inflation 
pressures by evaluating each wheel’s rota-
tional speed. This allows the system to de-
tect a significant loss of pressure in a tire. 
If a wheel’s rotational speed changes due 
to falling tire inflation pressure, you will 
see a corresponding warning message in 
the multifunction display.
The Run Flat Indicator may function in a re-
stricted manner or with a delay if:
snow chains are mounted to the 
vehicle
winter road conditions prevail
you are driving on a loose surface (e.g. 
sand or gravel)
you are driving in a very sporty manner 
(involving rapid acceleration or high 
speeds in curves)
Warning!G
When the multifunction display shows the 
message 
Tire Pressure Check Tires, 
one or more of your tires is significantly un-
derinflated. You should stop and check your 
tires as soon as possible, and inflate them to 
the proper tire inflation pressure as indicat-
ed on the vehicle’s Tire and Loading 
Information placard or, if available, on the 
tire inflation pressure label. Driving on a sig-
nificantly underinflated tire causes the tire 
to overheat and can lead to tire failure. Un-
derinflation also reduces fuel efficiency and 
tire tread life, and may affect the vehicle’s 
handling and stopping ability. Each tire, in-
cluding the spare, should be checked 
monthly when cold and set to the recom-
mended tire inflation pressure as specified 
on the Tire and Loading Information placard 
on the driver’s door B-pillar (
page 307) or, 
if available, on the tire inflation pressure 
label located on the inside of the fuel filler 
flap (
page 291).
Warning!G
The Run Flat Indicator does not indicate a 
warning for wrongly selected tire inflation 
pressures. Always adjust tire inflation pres-
sure according to the Tire and Loading 
Information placard on the driver’s door 
B-pillar (
page 307) or, if available, on the 
tire inflation pressure label located on the 
inside of the fuel filler flap (
page 291).
The Run Flat Indicator does not replace 
regular checks of the tire inflation pressures 
since a gradual pressure loss in more than 
one tire cannot be detected by the Run Flat 
Indicator.
The Run Flat Indicator is not able to issue a 
warning due to a sudden dramatic loss of 
tire inflation pressure (e.g. tire blowout 
caused by a foreign object). In this case 
bring the vehicle to a halt by carefully apply-
ing the brakes and avoiding abrupt steering 
maneuvers.