Page 173 of 304
173 Operation
Engine compartment
You can check the engine oil level with 
the oil dipstick
Open the hood (
page 171).
Pull out oil dipstick1 (
page 175) and 
wipe the tip clean.
Reinsert the oil dipstick into the dip-
stick guide tube as far as it will go.
1Oil dipstick
Pull out the oil dipstick again after 
approximately 3 seconds.
The oil level is acceptable when it 
leaves a line between the upper and 
lower marks of the dipstick.
For adding oil (
page 175).
See “Practical hints” (
page 200) if the 
low engine oil level warning lamp in the in-
strument cluster lights up.You can check the engine oil level on the 
odometer display (SLK 320 and 
SLK 32 AMG only)
Turn the key in the steering lock to 
position2.
1Knob
Wait until the symbols
:
 and
I
 
appear in the odometer display indica-
tor.
iFill quantity between upper and lower 
dipstick marking level is approximately 
2.1 US qt (2.0 l).
 
     
        
        Page 174 of 304

174 OperationEngine compartment
Within 1 second press knob1 on the 
instrument cluster twice.
One of the following messages will sub-
sequently appear in the indicator:
OK
-1.0 Q
 (Canada:
 -1.0 L
)
-1.5 Q
 (Canada:
 -1.5 L
)
-2.0 Q
 (Canada:
 -2.0 L
)
For adding oil (
page 175).If there is excessive engine oil with the en-
gine at normal operating temperature, a 
signal sounds and the following message 
will blink in the odometer display:
HI
Have excess oil siphoned.
If theI
 symbol flashes in the odometer 
display field, a proper oil level check can-
not be performed.
Wait 5 minutes before repeating check 
procedure.
Perform the oil level check with the dip-
stick (
page 173) if it cannot be complet-
ed via the odometer display field. In this 
case we recommend that you that you 
have the system checked at a 
Mercedes-Benz Center.See “Practical hints” (
page 200) if the 
low engine oil level warning lamp in the in-
strument cluster lights up.
!If the message 
-2.0 Q
 
(Canada:
-2.0 L
) blinks and a signal 
sounds, add oil according to amount 
displayed.
iIf the
:
 and
I
 symbols are con-
tinuously illuminated after pressing the 
left knob on the instrument cluster 
twice, and if there is no change in the 
odometer display field or the low en-
gine oil level warning lamp comes on, a 
malfunction has occurred to the sys-
tem. 
Perform the engine oil level check with 
the dipstick (
page 173).
If no oil leaks are noted, drive to the 
nearest Mercedes-Benz Center to have 
the system checked. 
     
        
        Page 175 of 304

175 Operation
Engine compartment
Adding engine oilSLK 230 Kompressor1Oil dipstick
2Oil filler cap
Unscrew oil filler cap2 from the filler 
neck.
Be careful not to overfill with oil.
Be careful not to spill any oil when 
adding. 
Avoid environmental damage caused 
by oil entering the ground or water.
Screw oil filler cap2 back onto the filler 
neck.
SLK 320, SLK 32 AMG1Oil dipstick
2Oil filler cap
Unscrew oil filler cap2 from the filler 
neck.Be careful not to overfill with oil.
Be careful not to spill any oil when 
adding. 
Avoid environmental damage caused 
by oil entering the ground or water.
Screw oil filler cap2 back onto the filler 
neck.
More information on engine oil can be 
found in the “Technical data” section 
(
page 271).
!Excessive oil must be siphoned or 
drained off. It could cause damage to 
the engine and catalytic converter not 
covered by the Mercedes-Benz Limited 
Warranty.
!Excessive oil must be siphoned or 
drained off. It could cause damage to 
the engine and catalytic converter not 
covered by the Mercedes-Benz Limited 
Warranty. 
     
        
        Page 200 of 304

200 Practical hintsWhat to do if …?When the low engine oil level warning lamp 
does not go out after starting the engine, 
or comes on while the engine is 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 oil 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.Problem
Possible cause
Suggested solution
_
The red telescoping steering 
column* warning lamp remains 
lit after starting the engine.
The adjustable steering column is not locked 
properly.
Lock the steering column 
(page 34).
W
The yellow low windshield and 
headlamp* washer system fluid 
level warning lamp remains lit af-
ter starting the engine or lights 
up while driving.
The fluid level has dropped to about
1/3 of 
total reservoir capacity.
Add washer fluid (
page 179).
N
The yellow low engine oil level 
warning lamp remains lit after 
starting the engine or lights up 
while driving.
The engine oil level is too low.
Check the engine oil level 
(page 172) and add oil as required 
(page 175).
If you must add engine oil frequently, 
have the engine checked for possible 
leaks.!The low engine oil level warning light 
should not be ignored. Extended driv-
ing with the light illuminated could re-
sult in serious engine damage that is 
not covered by the Mercedes-Benz 
Limited Warranty. 
     
        
        Page 287 of 304

287 Index
Battery discharged
Jump starting 247
Battery, vehicle 178, 245
Charging 246
Disconnecting 246
Reconnecting 246
Reinstalling 246
Removing 246
Block heater 184
Bolts
For spare wheel 207
Brake assist system (BAS) 279
Brake fluid 170, 271
Brake lamp bulbs 222
Brake lamp, high mounted 222
Brakes 160
Warning lamp 198
Break-in period 158
Bulbs, replacing 221
Additional turn signals 221
Backup lamps 222
Brake lamps 222
Fog lamps 221
Front lamps 221
High beam 221
High mounted brake lamp 222License plate lamps 222, 226
Low beam 221
Parking lamps 221, 222, 224
Rear fog lamp 222
Rear fog lamps 225
Side marker lamps 221, 225
Standing lamps 221, 222, 224
Tail lamp assemblies 222, 225
Turn signal lamps 221, 222
Xenon* headlamps 223
Button
Audio system 115
C
CAC (Customer Assistance Center) 279
California
Important notice 9
Calling up
Service indicator 186
CAN system 279
Capacities
Fuels, coolants, lubricants, etc. 269
Cargo area see Cargo compartment 77
Cargo compartment
Trunk 77
Casette mode
Playing cassettes 118Catalytic converter 166
CD changer* 120, 209
CD mode 120
Center console 23
AIRBAG OFF indicator lamp 205
Lower part 24
Storage compartment 140
Upper part 23
Central locking
From inside 80
Unlocking from inside 80
Certification label 258
Changing CDs 120
Charging
Vehicle battery 246
CHECK ENGINE malfunction indicator 
lamp 199
Checking
Coolant level 170, 176
Oil level 170, 172
Tire inflation pressure 170
Vehicle lighting 170
Checking engine oil level
Via engine oil level indicator 173
Via oil dipstick 173 
     
        
        Page 294 of 304

294 IndexManual transmission 91
Shifting into reverse 92
Starting with 40
Microphone
Hands-free microphone 25
Mirrors
Adjusting 35
Automatic antiglare for rear view 
mirror 99
Exterior rear view mirror 35
Inside rear view mirror 35
MON 169
MON (Motor Octane Number) 281
N
Night security illumination 87
O
Occupant safety 52
Airbags 53
Children and airbags 54
Children in the vehicle 60
Fastening the seat belt 37
Infant and child restraint systems 60
Seat belts 37, 55
Odometer, main 21
OilAdding 175
Checking level 172
Consumption 172
Dipstick 172
Filler neck 175
Viscosity 280
Oil level
Checking 170
One-touch gearshifting 94
Canceling gear range limit 94
Downshifting 94
Upshifting 94
Opening
Ashtray 142
Doors from the inside 78
Fuel filler flap 169
Fuel filler flap manually 213
Glove box 139
Hardtop in an emergency 215
Hood 171
Retractable hardtop 215
Side windows 127
Trunk 77
Windows 127
Operating
Audio system 111Garage door opener 155
Integrated remote control 155
Radio transmitters 166
Safety 14
Telephone 111
Telephone* 123
Vehicle outside the USA and 
Canada 11
Operating safety 14
Audio system 111
Operator’s Manual 8
Ornamental moldings 189
Outside temperature indicator 90
Overdue service 186
Overhead control panel 25
Overspeed range 281
P
Paintwork 188
Panic alarm 65
Panic button on remote control 65
Parcel net
In front passenger footwell 141
Parking 47, 161
Parking brake 42, 47
Engaging 47
Releasing 42