Page 297 of 491

296 OperationAt the gas stationRefueling
The fuel filler flap is located on the 
right-hand side of the vehicle towards the 
rear. Locking / unlocking the vehicle with 
the remote control automatically 
locks / unlocks the fuel filler flap.
Turn the engine off 
by turning the SmartKey to 
position0. 
by pressing the KEYLESS-GO* 
start/stop button. Open the driv-
er’s door (with the driver’s door 
open, starter switch is now in 
position0, same as SmartKey re-
moved from starter switch).
Remove the SmartKey from the starter 
switch.
Open the fuel filler flap by pushing at 
the point indicated by the arrow.
The fuel filler flap springs open.
Turn the fuel cap to the left and hold on 
to it until possible pressure is released.
Take off the cap and set it in the recess 
on the fuel filler flap.
To prevent fuel vapors from escaping 
into open air, fully insert filler nozzle 
unit.
Only fill your tank until the filler nozzle 
unit cuts out – do not top up or over-
fill.
Warning!
G
Gasoline is highly flammable and poisonous. 
It burns violently and can cause serious 
injury. Whenever you are around gasoline, 
avoid inhaling fumes and skin contact, extin-
guish all smoking materials. Never allow 
sparks, flame or smoking materials near 
gasoline!
Warning!
G
Overfilling of the fuel tank may create pres-
sure in the system which could cause a gas 
discharge. This could cause the gas to spray 
back out when removing the fuel pump noz-
zle, which could cause personal injury. 
     
        
        Page 298 of 491
297 Operation
At the gas station
Replace the fuel cap by turning it to the 
right.
You will hear when the fuel cap is tight-
ened.
Close the fuel filler flap.
Check regularly and before a long trip
1Windshield washer and headlamp 
cleaning system*
2Brake fluid 
3Coolant level
iLeaving the engine running and the fuel 
cap open can cause the yellow fuel 
tank reserve warning lamp to flash and 
the? malfunction indicator lamp 
(USA only) or the ± malfunction in-
dicator lamp (Canada only) to illumi-
nate.
For more information, see “Practical 
hints” (
page 357). 
iOnly use premium unleaded gasoline 
with a minimum Posted Octane Rating 
of 91  (average of 96 RON / 86 MON). 
Information on gasoline quality can 
normally be found on the fuel pump.
More information on gasoline can be 
found in the Factory Approved Service 
Products pamphlet. 
iOpening the hood, see (
page 299). 
     
        
        Page 473 of 491

472 IndexEngine oil
Adding 302
Checking level 300
Consumption 300
Display messages 382
Messages in display 301
Viscosity 460
ESP 89, 460
Four wheel electronic traction system 
with ESP 95
Switching off 91
Switching on 92
Synchronizing 367
Warning lamp 353
ETD 460
Safety guidelines 66
Exterior lamp switch 141
Exterior rear view mirrors
Adjusting 42
Parking position for 176
F
Fahrenheit
Setting temperature units 165
Fastening the seat belts 44
Fine adjustment
Cruise control 231First aid kit 401
Flat tire 418
Mounting the spare wheel 419
Spare wheel 419
Flexible Service System (FSS) 461
Floormats 268
Fog lamp, rear 145
Fog lamps
Switching on 144
Fog lamps, front
Messages in display 386
Switching on 144
Folding back folding bench seat 136
Folding bench seat in cargo 
compartment 134
Folding head restraints back 127
Following distance in Distronic* 239
Four wheel electronic traction system 
(4MATIC) with ESP 95
4MATIC 95
4-zone automatic climate control* 208
Front airbags 67
Front doors
Opening from inside vehicle 115
Front fog lamp
Replacing bulb 411Front interior lighting 148
Front lamps 411
Messages in display 387
Replacing bulbs 413
Switching on 141
Front reading lamps
Switching on/off 148
Front seat head restraints
Power seat 126
Removing and installing 126
Front seats
Heater* 132
FSS (Flexible Service System) 461
Fuel 297
Fuel tank reserve warning lamp 357
Premium unleaded gasoline 297
Fuel consumption statistics
After start 178
Since last reset 178
Fuel filler flap 296
Locking 296
Unlocking 296
Fuel reserve tank
Message in display 385
Fuel tank
Filler flap 296