Page 309 of 506
307 Operation
Engine compartment
1Filler cap (Gasoline engine)1Filler cap (Diesel engine)
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.
For more information on engine oil, see the 
“Technical data” section (
page 461) and 
(
page 464).!Excess oil must be siphoned or drained 
off. It could cause damage to the 
engine and catalytic converter (Gaso-
line engine) or oxidation catalyst (Die-
sel engine) not covered by the 
Mercedes-Benz Limited Warranty. 
         
        
        
     
        
        Page 310 of 506

308 OperationEngine compartmentTransmission 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 transmission.Coolant level
The engine coolant is a mixture of water 
and anticorrosion/antifreeze. To check 
the coolant level, the vehicle must be 
parked on level ground and the engine 
must be cool.
The coolant expansion tank is located on 
the driver’s side of the engine compart-
ment. 1Coolant expansion tank
Using a rag, turn the cap slowly approx-
imately one half turn to the left to re-
lease any excess pressure.
Continue turning the cap to the left and 
remove it.
The coolant level is correct if the level:
for cold coolant: reaches the black 
top part of the reservoir
for warm coolant: is approximately 
0.6 in (1.5 cm) higher
Add coolant as required.
Warning!
G
In order to avoid any possibly serious burns:
Use extreme caution when opening the 
hood if there are any signs of steam or 
coolant leaking from the cooling system, 
or if the coolant temperature gauge indi-
cates that the coolant is overheated.
Do not remove pressure cap on coolant 
reservoir if coolant temperature is 
above 158°F (70°C). Allow engine to 
cool down before removing cap. The 
coolant reservoir contains hot fluid and 
is under pressure.
Using a rag, slowly open the cap approx-
imately 
1/2 turn to relieve excess pres-
sure. If opened immediately, scalding 
hot fluid and steam will be blown out un-
der pressure.
Do not spill antifreeze on hot engine 
parts. Antifreeze contains ethylene gly-
col which may burn if it comes into con-
tact with hot engine parts. 
         
        
        
     
        
        Page 311 of 506

309 Operation
Engine compartment
Replace and tighten cap.
For more information on coolant, see the 
“Technical data” section (
page 466).
Battery
Your vehicle is equipped with two batter-
ies:
Auxiliary battery (located in the engine 
compartment).
Main battery (starter and electrical 
consumers; located in the trunk).
These batteries should always be suffi-
ciently charged in order to achieve their 
rated service life. Refer to Maintenance 
Booklet for battery maintenance intervals.
If you use your vehicle mostly for short-dis-
tance trips, you will need to have the bat-
tery charge checked more frequently.When replacing batteries, always use bat-
teries approved by Mercedes-Benz. 
If you do not intend to operate your vehicle 
for an extended period of time, consult an 
authorized Mercedes-Benz Center about 
steps you need to observe.
Batteries contain materials that can harm 
the environment if disposed of improperly. 
Recycling of batteries is the preferred 
method of disposal. Many states require 
sellers of batteries to accept old batteries 
for recycling.
G
Observe all safety instructions 
and precautions when handling 
automotive batteries. 
A
Risk of explosion.
D
Keep flames or sparks away 
from battery. Do not smoke.
B
Battery acid is caustic. Do not 
allow it to come into contact 
with skin, eyes or clothing. 
In case it does, immediately 
flush affected area with clear 
water and seek medical help if 
necessary.
E
Wear eye protection.
C
Keep children away.
F
Follow the instructions in this 
Operator's Manual. 
         
        
        
     
        
        Page 312 of 506

310 OperationEngine compartmentWindshield washer system and headlamp cleaning system*
The windshield washer reservoir is located 
in the engine compartment.
1Washer fluid reservoir
Fluid for the windshield washer system and 
the headlamp cleaning system is supplied 
from the windshield washer reservoir. It 
has a capacity of: 
Vehicles without headlamp cleaning 
system: approximately 4.8 US qt 
(4.5 l).
Vehicles with headlamp cleaning sys-
tem: approximately 7.4 US qt (7 l).During all seasons, add MB Windshield 
Washer Concentrate “S” to water. Premix 
the windshield washer fluid in a suitable 
container.
Refill the reservoir with MB Windshield 
Washer Concentrate and water (or 
commercially available premixed wind-
shield washer solvent / antifreeze, de-
pending on ambient temperatures).
Always use washer solvent/antifreeze 
where temperatures may fall below 
freezing point. Failure to do so could re-
sult in damage to the washer sys-
tem/reservoir.
For more information, see “Windshield and 
headlamp washer fluid mixing ratio” 
(
page 469).Warning!
G
Washer solvent / antifreeze is highly flam-
mable. Do not spill washer solvent /  
antifreeze on hot engine parts, because it 
may ignite and burn. You could be seriously 
burned.!Only use washer fluid which is suitable 
for plastic lenses. Improper washer flu-
id can damage the plastic lenses of the 
headlamps. 
         
        
        
     
        
        Page 344 of 506

342 OperationWinter drivingBlock heater* (Canada only)
The engine is equipped with a block heat-
er.
The electrical cable may be installed at an 
authorized Mercedes-Benz Center.Snow chains
Snow chains should only be driven on 
snow-covered roads at speeds not to ex-
ceed 30 mph (50 km/h). Remove chains 
as soon as possible when driving on roads 
without snow.Please observe the following guidelines 
when using snow chains:
Use of snow chains is not permissible 
with all wheel/tire combinations.
Snow chains should only be used on 
the rear wheels. Follow the manufac-
turer's mounting instructions.
Only use snow chains that are ap-
proved by Mercedes-Benz. Your autho-
rized Mercedes-Benz Center will be 
glad to advise you on this subject.
Use of snow chains may be prohibited 
depending on location. Always check 
local and state laws before installing 
snow chains.
!When driving with snow chains, always 
select the raised level of the level con-
trol system Airmatic* (
page 248). 
Other settings may result in damage to 
your vehicle.
iWhen driving with snow chains, you 
may wish to deactivate the ESP 
(page 89) before setting the vehicle 
in motion. This will improve the vehi-
cle’s traction.
!Even on vehicles with all-wheel-drive, 
use snow chains on rear tires only.
Use of snow chains is not permissible 
with tire sizes:
265/35 ZR18
T 155/70 R17 110M
T 175/55-18 95P 
         
        
        
     
        
        Page 346 of 506

344 OperationMaintenance
Clearing the maintenance service indicator
You can clear the maintenance service in-
dicator.
Press the reset button 1 on the left 
side of the instrument cluster.
The maintenance service indicator is 
cleared and the standard display ap-
pears in the multifunction display.
Maintenance service term exceeded
If you have exceeded the suggested main-
tenance service term, you will see the fol-
lowing message in the multifunction 
display:Service A exceeded by XXXXX miles (km)
Service A exceeded by XXX days 
Service A exceeded by X day In addition, a signal sounds when the mes-
sage appears.
Any authorized Mercedes-Benz Center will 
reset the maintenance service indicator 
following a completed maintenance 
service.
iVehicles equipped with FSS PLUS 
(Flexible S
ervice S
ystem PLUS) only 
(Canada vehicles): The interval be-
tween maintenance services depends 
on your driving habits. A gentle driving 
style, moderate engine speeds and the 
avoidance of short-distance trips will 
lengthen the interval between services. 
         
        
        
     
        
        Page 347 of 506

345 Operation
Maintenance
Calling up the maintenance service indicator
Switch on the ignition (
page 33).
The standard display of the control sys-
tem appears (
page 145).
Press button k or j on the mul-
tifunction steering wheel until the 
maintenance service indicator with the 
service symbol 9 or ´ and the 
service deadline appears in the multi-
function display.Resetting the maintenance service 
indicator 
In the event that the maintenance service 
on your vehicle is not carried out by an au-
thorized Mercedes-Benz Center, you can 
have the maintenance service indicator re-
set. The automotive maintenance facility 
carrying out the maintenance service will 
find the information for resetting the main-
tenance service indicator in the mainte-
nance-relevant information for your 
vehicle. Such information is available from 
either your authorized Mercedes-Benz 
Center or directly from Mercedes-Benz.
iIf the battery is disconnected, the days 
of disconnection will not be included in 
the count shown by the maintenance 
service indicator. To arrive at the true 
maintenance service deadline, you will 
need to subtract these days from the 
days shown in the maintenance service 
indicator.
Do not confuse the maintenance ser-
vice indicator with the engine oil level 
indicator :.
iIf the maintenance service indicator 
was inadvertently reset, have an autho-
rized Mercedes-Benz Center correct it.
Only reset if the proper maintenance 
service has been performed. Resetting 
the system without performing the 
proper service as called for by the 
maintenance service indicator will re-
sult in engine damage and/or other ve-
hicle damage not covered by the 
Mercedes-Benz Limited Warranty. 
         
        
        
     
        
        Page 352 of 506

350 OperationVehicle careEngine cleaning
Prior to cleaning the engine compartment, 
make sure to protect electrical compo-
nents and connectors from contact with 
water and cleaning agents.
Corrosion protection, such as MB Anticor-
rosion Wax should be applied to the engine 
compartment after every engine cleaning. 
Before applying, all control linkage bush-
ings and joints should be lubricated. The 
poly-V-belt and all pulleys should be pro-
tected from any wax. 
Vehicle washing
Do not use hot water or wash your vehicle 
in direct sunlight. Only use a mild car wash 
detergent, such as Mercedes-Benz ap-
proved Car Shampoo.
Thoroughly spray the vehicle with a dif-
fused jet of water. Direct only a very weak 
spray towards the ventilation intake. Use 
plenty of water and rinse the sponge and 
chamois frequently. Rinse with clear water and thoroughly dry 
with a chamois. Do not allow cleaning 
agents to dry on the finish.
Due to the width of the vehicle, fold in 
exterior rear view mirrors prior to running 
the vehicle through an automatic car wash 
to prevent damage to the mirrors.
In the winter, thoroughly remove all traces 
of road salt as soon as possible.
When washing the underbody, do not for-
get to clean the inner sides of the wheels.Ornamental moldings
For regular cleaning and care of very dirty 
chrome-plated parts, use a chrome clean-
er.
Headlamps, tail lamps, side markers, 
turn signal lenses
Use a mild car wash detergent, such as 
Mercedes-Benz approved Car Shampoo, 
with plenty of water.
To prevent scratches, never apply strong 
force and only use a soft, non-scratchy 
cloth when cleaning the lenses. Do not at-
tempt to wipe dirty lenses with a dry cloth 
or sponge.
iVehicles with KEYLESS-GO*:
If a door handle is hit by a strong jet of 
water, and a SmartKey with 
KEYLESS-GO* is in close proximity, i.e. 
within approximately 3 ft (approxi-
mately 1 m), the vehicle could be inad-
vertently locked or unlocked.