1999 MERCEDES-BENZ C-CLASS fuel pressure

Drive Sensibly - Save Fuel


Fuel consumption, to a great extent, depends on driving habits and operating conditions. To save fuel you should:
• keep tires at the recommended inflation pressures,
• remove unnecessary loads,
• remove roof rack when not in use,
• allow engine to warm up under low load use,
• avoid frequent acceleration and deceleration,
• have all maintenance work performed at regular intervals by an authorized Mercedes-Benz dealer.

Fuel consumption is also increased by driving in cold weat her, in stop-and-go traffic, on short trips and in hilly country.





MERCEDES-BENZ
ROADSIDE ASSISTANCE
1-800-FOR MERCEDES (in the USA.)
1-800-387-0100 (in Canada)






What You Should Know
at the Gas Station


• Fuel:
To prevent fuel vapors from escaping into open air, fully inse rt filler nozzle unit. Only fill fuel tank until the filler nozzl e
unit cuts out - do not overfill. Leaving the engine running and t he fuel cap open can cause the "Check Engine" lamp to
illuminate. Use premium unleaded gasoline: Posted Octane Index 91 (Average of 96 RON/86 MON).
Fuel tank capacity approx. 16.4 US gal (62.0 I).
This includes approx. 2.1 US gal (8.0 I) reserve.

Warning !
Gasoline is highly flammable and poisonous, it burns violently and can cause serious injury. Whenever you
are around gasoline, avoid inhaling fumes and skin cont act, extinguish all smoking materials. Never allow
sparks, flame or smoking materials near gasoline!


• Engine Oil:
Engine oil level check, see Index.
Fill quantity between upper and lower dipstick marking level: 2.1 US qt (2.0 I).
Recommended engine oils, see Index.

• Spark Plugs:
Approved spark plugs, refer to "Technical Data".


• Coolant:
For normal replenishing, use water (potable water quality).
For further information (e.g. anticor rosion/antifreeze), refer to Index.









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• Bulbs:
High beam: HI (55 W),
low beam: H7 (55 W),
low beam: Xenon (optional)
fog lamps: HI (55 W),
turn signal lamps, parking and standing la mps, front: 2357 NA (28.5/8.3 W/30/2.2 cp),
stop lamps: 21 W/32 cp,
backup lamps: 21 W/32 cp,
turn signal lamps, rear: 21 W/32 cp,
tail, parking, side marker and standing lamp: 5 W/4 cp,
tail and parking lamp, passenger side: 21/4 W,
tail, parking arid rear fog lamp, driver's side: 21/4W,
license plate lamps: 5 W.

• Tire Pressure:
For tire pressure, refer to tire pressure label inside the fuel filler flap.

• Air Conditioner:
R-134a refrigerant and special PAG lubricant, re fer to "Technical Data" (also see Index).


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Tire Inflation Pressure
A table (see fuel filler flap) lists the tire inflation pressures specified for Mercedes-Benz recommended tires as well as
for the varying operating conditions.

Important !
Tire pressure changes by approx. 1.5 psi (0.1 bar) per 18°F (10°C) of air temperature change. Keep this in mind
when checking tire pressure inside a garage - especially in the winter.
Example:
If garage temperature = approx. +68°F (+20°C) and ambient te mperature = approx. +32°F (0°C) then the adjusted air
pressure = specified air pressure +3 psi (+0.2 bar).
Tire pressures listed for light loads are minimum values o ffering high driving comfort. Increased inflation pressures for
heavy loads produce favorable handling characteristics with lighter loads arid are perfectly permissible. The ride of
the vehicle, however, will become somewhat harder.
Tire temperature and pressure increase with the vehicle speed. Tire pressure should therefore only be corrected on
cold tires. Correct tire pressure in warm tires only if pressure has dropped below the pressure listed in the table and
the respective operating conditions are taken into consideration.
An underinflated tire due to a slow leak (e.g. due to a
nail in the tire) may cause damage such as tread separation, bulging etc.. Regular tire pressure checks (including the
spare tire) at intervals of no more than 14 days are therefore essential. If a tire constantly loses air, it should be
inspected for damage.

Warning !
Do not overinflate tires. Overinfiating tires can result in sudden deflation (blowout) because they are more
likely to become punctured or damaged by road debris, potholes etc.. Follow recommended inflation
pressures.
Do not overload the tires by exceeding the specified vehicle capacity weight (as indicated by the label on the
driver's door latch post). Overloading the tires can overheat them, possibly causing a blowout.


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Premium Unleaded Gasoline

Caution !
To maintain the engine's durability and performance, premium unleaded gasoline must be used. If premium unleaded
is not available and low octane fuel is used, follow these precautions:
• have the fuel tank filled only partially 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 3000 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 positi on, if the vehicle is fully loaded or operating
in mountainous terrain.


Fuel Requirements
Use only Premium unleaded meeting ASTM standard D 439: The octane number (posted at the pump) must be 91
min.
It is an average of both the Research (R) octane number an d the Motor (M) octane number: [(R+M)/2]. This is also
known as ANTI-KNOCK INDEX. Unleaded gasoline containing oxygenates such as Ethanol, I PA, 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 components. 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..


Gasoline Additives
A major concern among engine manufacturers is carbon build up caused by gasoline. Mercedes- Benz recommends
the use of only quality gasoline containing additives that prevent the build up of carbon deposits. After an extended
period of using fuels without such additives, carbon deposit s can build up especially on the intake valves and in the
combustion area, leading to engine performance problems such as:
• warm-up hesitation,
• unstable idle,
• knocking/pinging,
• misfire,
• power loss.
Do not blend other specific fuel additives with fuel. They only result in unnecessary cost, and may be harmful to the
engine operation. Damage or malfunctions resulting from poor fuel quality or from blending specific fuel additives are
not covered by the Mercedes-Benz Limited Warranty.


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Check Regularly and Before a Long Trip

The engine compartment of model C 230 is illustrated.
1. Fuel Supply
Open flap by pushing near front (arrow). Turn fuel cap
to the left and hold on to it until possible pressure in tank
has been released, then remove cap.
Failure to remove slowly could result in personal injury.

2. Tire Inflation Pressure
Check at least every two weeks.
For details see Index.

3. Coolant Level

See Adding coolant in Index.
4. Windshield Washer System,
Headlamp Cleaning System


For refilling reservoir see Index.
5. Engine Oil Level
See Index.

6. Brake Fluid
See Index.


Vehicle Lighting: Check function and cleanliness.
For replacement of light bulbs, see Index.


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