Page 324 of 514

323 Operation
Engine compartment
Checking engine oil level with the 
control system
When checking the oil level
the vehicle must be parked on level 
ground
with the engine at operating tempera-
ture, the vehicle must have been 
stationary for at least 5 minutes with 
the engine turned off
with the engine not at operating tem-
perature yet, the vehicle must have 
been stationary for at least 30 minutes 
with the engine turned off
To check the engine oil level via the 
multifunction display, do the following:
Switch on the ignition (
page 34).
The standard display (
page 144) should 
appear in the multifunction display.
Press buttonk or j on the mul-
tifunction steering wheel until the fol-
lowing message is seen in the 
multifunction display:One of the following messages will 
subsequently appear in the multifunc-
tion display:
Engine oil level
ok
Add 1.0 qt.
to reach max. oil level(Canada: 
1.0 liter
)
Add 1.5 qt.
to reach max. oil level(Canada: 
1.5 liter
)
Add 2.0 qt.
to reach max. oil level(Canada: 
2.0 liter
)
If necessary, add engine oil.
For adding engine oil, see (
page 325).
For more information on engine oil, see the 
“Technical data” section (
page 479) and 
(
page 481).
Other display messages
If the SmartKey is not turned to position2 
in the starter switch, the following 
message will appear:
Turn on ignition
to see engine oil level
Switch on the ignition (
page 36).
iIf you want to interrupt the checking 
procedure, press thek orj 
button on the multifunction steering 
wheel. 
     
        
        Page 326 of 514

325 Operation
Engine compartment
1Oil dipstick
2Upper (max) mark
3Lower (min) mark
To check the engine oil level with the oil 
dipstick, do the following:
Open the hood (
page 321).
Pull out oil dipstick1.
Wipe oil dipstick1 clean.
Fully insert oil dipstick1 into the 
dipstick guide tube.
Pull out oil dipstick1 again after 
approximately 3 seconds to obtain ac-
curate reading.
The oil level is correct when it is be-
tween the lower (min) mark3 and 
upper (max) mark2 of oil dipstick1.
If necessary, add engine oil.
For adding engine oil, see “Adding en-
gine oil” (
page 325).
For more information on engine oil, see 
“Fuels, coolants, lubricants, etc.” 
(
page 479).
For more information on messages in the 
multifunction display concerning engine 
oil, see the “Practical hints” section 
(page 401).Adding engine oiliThe filling quantity between the upper 
and lower marks on the oil dipstick is 
approximately 2.1 US qt. (2.0 l).
!Only use approved engine oils and oil 
filters required for vehicles with 
Maintenance System (U.S. vehicles) or 
FSS (Canada vehicles). For a listing of 
approved engine oils and oil filters, 
refer to the Factory Approved Service 
Products pamphlet in your vehicle 
literature portfolio, or contact an 
authorized Mercedes-Benz Center.
Using engine oils and oil filters of 
specification other than those 
expressly required for the Maintenance 
System (U.S. vehicles) or FSS (Canada 
vehicles), or changing of oil and oil filter 
at change intervals longer than those 
called for by the Maintenance System 
(U.S. vehicles) or FSS (Canada vehi-
cles) will result in engine damage not 
covered by the Mercedes-Benz Limited 
Warranty. 
     
        
        Page 327 of 514
326 OperationEngine compartmentCLK 3501Filler capCLK 500, CLK 55 AMG1Filler cap
Unscrew filler cap1 from filler neck.
Add engine oil as required. 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 filler cap1 back on filler neck.
More information on engine oil can be 
found in the “Technical data” section 
(
page 479) and (
page 481).
Transmission fluid level
The transmission fluid level does not need 
to be checked. If you notice transmission 
fluid loss or gear shifting malfunctions, 
have an authorized Mercedes-Benz Center 
check the automatic transmission.
!Excess 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 499 of 514

498 IndexEngine coolant see Coolant
Engine oil 322, 481
Adding 325, 481
Additives 481
Changing 325, 481
Checking level 320
Checking level (Dipstick) 324
Consumption 322
Filler cap 326
Filler neck 326
Messages in display 323, 401
Viscosity 488
Engine oil level 320, 323
ESP
®
25, 89, 488
Messages in display 387–388
Warning lamp 378
ETD 72, 488
Safety guidelines 66
Exterior rear view mirrors 43, 181
Parking position 161, 183F
Filler cap, Engine oil 326
Filler neck, Engine oil 326
First aid kit 413
Flat tire 446
Jacking up the vehicle 447
Lowering the vehicle 451
Minispare wheel 416
Mounting the spare wheel 447
Preparing the vehicle 446
Flexible Service System see FSS 
(Canada vehicles)
Floormats* 287
Fluids
Brake fluid 320, 481
Engine coolant 327, 484
Engine oil 322, 481
Transmission fluid 326
Windshield washer and headlamp 
cleaning* system 329, 486
Fog lamps 131, 439
Messages in display 405
Replacing bulbs 438, 439, 443
Front air bags 67
Front lamps see HeadlampsFront passenger front air bag 63, 67
Messages in display 389–392
Front passenger front 
air bag off indicator lamp 27, 81, 381
FSS (Canada vehicles) 361, 488
Fuel 319, 479
Additives 483
Automatic transmission fluid 479
Brake fluid 479
Capacities 479
Capacities, Fuel tank 480
Engine coolant 480
Engine oil 479
Filling the tank 318
Fuel display 25
Fuel filler flap and cap 318, 421
Fuel filler flap and cap, Multifunction 
display messages 400
Fuel reserve warning lamp 379
Power steering fluid 479
Premium 
unleaded gasoline 319, 480, 482
Requirements, Octane rating 482
Technical data 479
Fuel cap
Message in display 376