Page 159 of 273

156 Driving instructions
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Caution!
When driving down long and steep grades, relieve the 
load on the brakes by shifting into a lower gear to use 
the engine’s braking power. This helps prevent 
overheating of the brakes and reduces brake pad wear.
After hard braking, it is advisable to drive on for some 
time, rather than immediately parking, so the air stream 
will cool down the brakes faster.
Driving off
Apply the service brakes to test them briefly after 
driving off. Perform this procedure only when the road 
is clear of other traffic.
Warm up the engine smoothly. Do not place full load on 
the engine until the operating temperature has been 
reached.
W hen sta rting  of f on a  sl ippery surfa ce, d o not al low one 
drive wheel to spin for an extended period with the ESP 
switched off. Doing so may cause serious damage to the 
drive train which is not covered by the Mercedes-Benz 
Limited Warranty.Parking
Wa r n i n g !
To reduce the risk of personal injury as a result of 
vehicle movement, before
 turning off the engine 
and leaving the vehicle, always:
1. Keep right foot on the service brake pedal.
2. Firmly engage parking brake.
3. Move the selector lever to position “P”
(manual transmission: first or reverse gear).
4. Slowly release the service brake pedal.
5. Turn front wheels towards the road curb.
6. Turn the key to steering lock position 0 and 
remove.
7. Take the key and lock vehicle when leaving. 
         
        
        
     
        
        Page 171 of 273

168 Driving systems
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Antilock brake system (ABS)
Important!
The ABS improves steering control of the vehicle during 
hard braking maneuvers.
The ABS prevents the wheels from locking up above a 
vehicle speed of approximately 5 mph (8 km / h) 
independent of road surface conditions.At the instant one of the wheels is about to lock up, a 
slight pulsation can be felt in the brake pedal, 
indicating that the ABS is in the regulating mode. Keep 
firm and steady pressure on the brake pedal while 
experiencing the pulsation.
Continuous steady brake pedal pressure results in 
applying the advantages of the ABS, namely braking 
power and ability to steer the vehicle.
In the case of an emergency brake maneuver keep 
continuous full pressure on the brake pedal. In this 
manner only can the ABS be most effective.
On slippery road surfaces, the ABS will respond even 
with light brake pedal pressure because of the 
increased likelihood of locking wheels. The pulsating 
brake pedal can be an indication of hazardous road 
conditions and functions as a reminder to take extra 
care while driving.
Wa r n i n g !
Do not pump the brake pedal, rather use firm, 
steady brake pedal pressure. Pumping the brake 
pedal defeats the purpose for ABS and significantly 
reduces braking effectiveness. 
         
        
        
     
        
        Page 174 of 273

171 Driving systems
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Notes:
Th e m alf unction indicator l amp for t he ESP is combined  
with that of the BAS.
The yellow BAS / ESP malfunction indicator lamp in the 
instrument cluster and the yellow ESP warning 
lampv in the speedometer dial come on with the 
key in steering lock position 2. They should go out with 
the engine running.
If the BAS / ESP malfunction indicator lamp comes on 
continuously with the engine running, a malfunction 
has been detected in either system. Only partial engine 
output will be available.
If the BAS malfunctions, the brake system functions in 
the usual manner, but without BAS.
Have the BAS or ESP checked at your authorized 
Mercedes-Benz Center as soon as possible.
With the ABS malfunctioning, the ESP is also switched 
off.Driving the vehicle with varied size tires will cause the 
wheels to rotate at different speeds, therefore the ESP 
may activate (yellow ESP warning lamp in speedometer 
dial comes on). For this reason, all wheels, including the 
spare wheel, must have the same tire size.
When testing the parking brake on a brake test 
dynamometer, the engine must be shut off. Otherwise, 
the ESP will immediately be engaged and will apply the 
rear wheel brakes.
In winter operation, the maximum effectiveness of the 
ESP is only achieved with Mercedes-Benz recommended 
M+S rated radial-ply tires and / or snow chains.
Synchronizing ESP
If the power supply was interrupted (battery 
disconnected or empty), the BAS / ESP malfunction 
indicator lamp may be illuminated with the engine 
running.
Turn steering wheel completely to the left and then to 
the right. The BAS / ESP malfunction indicator lamp 
should go out. 
         
        
        
     
        
        Page 187 of 273

184 Malfunction and indicator lamps
Te ch n ica l
data Instruments 
and controlsOperation DrivingInstrument 
cluster displayPractical hints Car care Index
Low engine oil level warning lamp
With the key in steering lock position 2, the 
oil level warning lamp comes on. It should 
go out immediately when the engine is 
running.
If the warning lamp does not go out after starting the 
engine, or comes on with the engine running and at 
operating temperature, the engine oil level has dropped 
to approximately the minimum mark on the dipstick.
When this occurs, the warning lamp will first come on 
intermittently and then stay on if the oil level drops 
further.
If no leaks are noted, continue to drive to the nearest 
service station where the engine oil should be topped to 
the “full” mark on the dipstick with an approved oil.
The low engine oil level warning light should not be 
ignored. Extended driving with the light illuminated 
could result in serious engine damage that is not 
covered by the Mercedes-Benz Limited Warranty.
In addition to the warning lamp, the engine oil level 
should be periodically checked with the dipstick, for 
example during a fuel stop, or before a long trip, see 
page 193.Charge indicator lamp
Should the charge indicator lamp fail to 
come on prior to starting when the key is in 
ste ering lock position 2 or sh ou ld  it fa il to g o 
out after starting or during operation, this indicates a 
malfunction which must be repaired immediately at an 
authorized Mercedes-Benz Center.
If t he charg e ind ica tor l amp comes on, or a l oss of  power 
steering assistance is noticeable while the engine is 
running, this may indicate that one of the two poly-V-
belts has broken. Should this condition occur, the poly-
V-belt mu st be replac ed before continuing to operate  t he 
vehicle. Otherwise, the engine may overheat due to an 
inoperative water pump which may result in damage to 
the engine.
Do not continue to drive the vehicle with the charge 
indicator lamp illuminated. Doing so could result in 
serious engine damage that is not covered by the 
Mercedes-Benz Limited Warranty. 
         
        
        
     
        
        Page 218 of 273

215 Towing the vehicle
Te ch n ica l
data Instruments 
and controlsOperation DrivingInstrument 
cluster displayPractical hintsCar care Index Sport Package
G r il l e  re m ova l  f or  S p or t  Pa cka g e  v e rs i on :  P u l l  on  t op  e n d  
of grille simultaneously pushing apron (arrow) up.
Grille installation for Sport Package: Position bottom 
end of grille and press in securely simultaneously 
pushing apron (arrow) up.
We recommend that the vehicle be transported using 
f lat bed equipment. This method is preferable to other 
types of towing.Do not tow with sling-type equipment. Front towing 
with sling-type equipment over bumpy roads will 
damage radiator and supports. Rear towing with sling-
type equipment over bumpy roads will damage the 
lower edge of the front bumper cover.
Use wheel lift, dolly, or f lat bed equipment, with key in 
steering lock turned to position 0.
Towing restrictions for vehicles with automatic 
transmission: The vehicle may be towed with all wheels 
on the ground and the selector lever in position “N” for 
distances up to 30 miles (50 km) and at a speed not to 
exceed 30 mph (50 km / h). The key must be in steering 
lock position 2.
To be certain to avoid a possibility of damage to the 
transmission, however, we recommend the drive shaft 
be disconnected at the rear axle drive f lange for any 
towing beyond a short tow to a nearby garage.
P88.00-2045-26
Wa r n i n g !
With the engine not running, there is no power 
assistance for the braking and steering systems. In 
this case, it is important to keep in mind that a 
considerably higher degree of effort in necessary to 
brake and steer the vehicle. 
         
        
        
     
        
        Page 236 of 273

233 Contents - Vehicle care
Te ch n ica l
data Instruments 
and controlsOperation DrivingInstrument 
cluster displayPractical hintsCar careIndex
Vehicle careCleaning and care 
of the vehicle  .............................234
Power washer ..............................235
Paintwork, painted body 
components  .................................235
Tar stains  .....................................235
Engine cleaning ..........................236
Vehicle washing  .........................236
Headlamps, taillamps, 
turn signal lenses  ......................237
Window cleaning ........................237Rear window cleaning  .............. 237
Wiper blades  .............................. 238
Light alloy wheels  ..................... 238
Instrument cluster ..................... 238
Steering wheel and 
gear selector lever  ..................... 239
Cup holder  .................................. 239
Hard plastic trim items ............. 239
Plastic and rubber parts  ........... 239
Headliner and 
shelf behind roll bars ................ 239
Upholstery  .................................. 239
Seat belts ..................................... 240 
         
        
        
     
        
        Page 248 of 273
245 Technical data
Te ch n ica l
data Instruments 
and controlsOperation DrivingInstrument 
cluster displayPractical hints Car care Index Layout of poly-V-belt drive
SLK 230 Kompressor 
routing, belt I
The engine is equipped with two poly-V-belts.
1Crankshaft
2Air conditioner compressor
3Power steering pump
4Coolant pumpSLK 230 Kompressor 
routing, belt II
For dimensions of the poly-V-belts, see page 248.
5Idler pulley 
6Generator (alternator)
7Idler pulley 
8Idler pulley 
9Supercharger
P13.20-2007-26
9
6
8
7
4
1
5
32
5
32
9
6
8
4
1
7
P13.20-2008-26 
         
        
        
     
        
        Page 249 of 273
246 Technical data
Te ch n ica l
data Instruments 
and controlsOperation DrivingInstrument 
cluster displayPractical hints Car care Index
SLK 230 Kompressor 
routing combined, belts I and II1Crankshaft
2Air conditioner compressor
3Power steering pump
4Coolant pump
5Idler pulley 
6Generator (alternator)
7Idler pulley 
8Idler pulley 
9Supercharger
9
6
8
7
4
1
5
32P13.20-2009-26