391 Technical data
Fuels, coolants, lubricants, etc.
Premium unleaded gasoline
Fuel requirements
Only use premium unleaded fuel:
The octane number (posted at the 
p um p) m us t be 91 mi n. It i s an a vera ge  
of both the Research (R) octane num-
ber and the Motor (M) octane number: 
(R+M)/2. This is also known as the 
ANTI-KNOCK INDEX.Unleaded gasoline containing oxygenates 
such as Ethanol, IPA, IBA and TBA can be 
used provided the ratio of any one of these 
oxygenates to gasoline does not 
exceed 10%; MTBE must not exceed 15%.
The ratio of Methanol to gasoline must not 
exceed 3% plus additional cosolvents.
Using mixtures of Ethanol and Methanol is 
not allowed. Gasohol, which contains 10% 
Ethanol and 90% unleaded gasoline, can 
be used.
These blends must also meet all other fuel 
requirements, such as resistance to spark 
knock, boiling range, vapor pressure, etc.
!To maintain the engine’s durability and 
performance, premium unleaded gaso-
line must be used. If premium unleaded 
is not available and low octane fuel is 
used, follow these precautions:
Have the fuel tank only partially 
filled with unleaded regular and fill 
up with premium unleaded as soon 
as possible.
Avoid full throttle driving and abrupt 
acceleration.
Do not exceed an engine speed of 
3 000 rpm if the vehicle is loaded 
with a light load such as two 
persons and no luggage.
Do not exceed
2/3 of maximum 
accelerator pedal position if the 
vehicle is fully loaded or operating 
in mountainous terrain.
iFlexible Fuel Vehicles (identified by a 
label reading Premium gasoline or 
E85 only! are designed to operate on 
premium unleaded gasoline or Ethanol 
fuel (E85) or any mixture of these two.
For more information, see “Flexible 
Fuel Vehicles” (
page 392). 
422 Index
Automatic antiglare* 
for rear view mirror 169
Exterior rear view mirror 41
Exterior rear view mirror 
parking position* 148
Interior rear view mirror 41
Storing exterior rear view mirror 
parking position* 108
MON 276, 401
Motor Octane Number see MON
Mph or km/h in speedometer 135
Multicontour seats* 104
Multifunction display 121, 401
Displaying gear range 159
Selecting language 136
Setting date (day) 140
Setting date (month) 139
Setting date (year) 141
Multifunction display messages
ABS 310
BAS 311
Brake fluid 315
Brake pads 315Coolant 316–318
Cruise control 319
Display 319
Doors 319
Engine oil 320–321
ESP 312–313
Fuel cap 305, 322
Hood 322
Key, SmartKey 322
Lamps, exterior 323–326
Oil 320–321
Parking brake 315
Restraint system 313
Seat belt system 327
SRS 313
Steering gear oil level 327
Tele Aid* 328
Telephone* 328
Tilt/sliding sunroof* 328
Trunk lid 328
Windshield washer fluid 328
Multifunction steering 
wheel 26, 122, 401
Buttons 122N
Navigation system*
Operating 130
See separate COMAND* 
operating instructions
Night security illumination 112
Setting 143
O
Occupant safety 58
Air bags 59
Children and air bags 60
Children in the vehicle 67
Fastening the seat belt 43
Infant and child restraint systems 67
LATCH-type child seat anchors 73
Seat belts 43, 62
Odometer, main 121
Oil
Adding 281
Oil level see Engine oil level
Oil see Engine oil