Page 308 of 489

307 Operation
At the gas station
Check regularly and before a long tripEngine compartment (CLK 500, example)1Coolant level
2Brake fluid (fuse box cover removed)
3Windshield washer and headlamp
cleaning system*Coolant
For normal replenishing, use water (pota-
ble water quality). For more information,
see “Coolant” (
page 314) and see “Fu-
els, coolants, lubricants, etc.”
(
page 452).
Brake fluid
Removing fuse box cover,
see (page 437).Windshield washer and headlamp
cleaning system*
For more information on filling up the
washer reservoir, see “Windshield washer
system and headlamp cleaning system*”
(
page 316).
Engine oil level
For more information on engine oil, see
“Engine oil” (
page 309).
Vehicle lighting
Check function and cleanliness. For more
information on replacing light bulbs, see
“Replacing bulbs” (
page 412).
For more information, see “Exterior lamp
switch” (
page 52).
Tire inflation pressure
For more information, see “Checking tire
inflation pressure” (
page 328).
iOpening the hood, see (
page 308).
!If you find that the brake fluid in the
brake fluid reservoir has fallen to the
minimum mark or below, have the
brake system checked for brake pad
thickness and leaks immediately.
Notify an authorized Mercedes-Benz
Center immediately. Do not add brake
fluid as this will not solve the problem.
For more information, see also “Practi-
cal hints” (
page 361).
Page 456 of 489

455 Technical data
Fuels, coolants, lubricants, etc.
Premium unleaded gasoline
Fuel requirements
Only use premium unleaded fuel:
The octane number (posted at the
pump) must be 91 min. It is an average
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 not to 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.
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!
!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 per-
sons and no luggage.
Do not exceed
2/3 of maximum ac-
celerator pedal position if the vehi-
cle is fully loaded or operating in
mountainous terrain.
Page 481 of 489

480 IndexPractical hints 360
Premium unleaded gasoline 455
Problems
While driving 56
With vehicle 17
Product information 9
Production options weight 343
Program mode selector switch 464
Automatic shift program 176
PSI 343
Push-start see Tow-start
R
Radio
Operation 216
Selecting stations 149
Selecting stations (satellite*) 149
Radio transmitters 302
Range (distance to empty) 166
Reading lamp 29, 139
Rear bench seat, foldable 265
Rear fog lamp see Fog lamps
Rear lamps see Tail lamps
Rear seat ashtray see Ashtray
Rear seat head restraints see
Head restraintsRear side windows
Blocking operation 85
Rear view mirrors see Mirrors
Rear window defroster 185
Rear window sunshade*
(Canada only) 184
Recommended engine oils
and oil filter 454
Recommended tire
inflation pressure 343
Recovery services,
Stolen vehicle (Tele Aid) 286
Refrigerant, Air conditioning 454
Refueling 305
Regular checks 307
Reminder, Seat belt see Seat belts, Telltale
Remote control
SmartKey 98, 103
SmartKey with KEYLESS-GO* 103
Remote door unlock (Tele Aid) 286
Removing
Ski sack* (Canada only) 265Replacing bulbs 412
Additional turn signals 412
Backup lamps 413, 417
Brake lamps 413
Corner-illuminating
front fog lamp* 412
Fog lamps 412, 413, 417
Headlamp bulbs 414
Headlamps 412
High beam flasher (Bi-Xenon*) 412
High beam flasher (Halogen) 412
High beam headlamps
(Bi-Xenon*) 412
High beam headlamps
(Halogen) 412, 414
High mounted brake lamp 413
License plate lamps 413, 417
Low beam headlamps
(Bi-Xenon*) 412
Low beam headlamps
(Halogen) 412, 414
Parking lamps 412, 413, 415, 416
Side marker lamps 412
Standing lamps 412, 413, 415, 416
Tail lamps 413, 417
Turn signal lamps 412, 413, 417