Emission System Maintenance - Mercedes-Benz C Service Booklet

Emission Control System Caution -
Gasoline Engines
Your Mercedes-Benz vehicle is equipped
with both a three-way catalyst and a closed
loop oxygen sensor system to comply with
current exhaust emission regulations. Keep
your vehicle in proper operating condition
by following our recommended maintenance
instructions as outlined.
The following has to be adhered to:
a) In all gasoline engine models, use
only premium unleaded gasoline with
an anti-knock index of at least 91
(as displayed on the pump) unless
otherwise specified. Damage to the
engine could occur if premium unleaded
fuel is not used. Refer to the Operator's
Manual for special precautions.
b) Leaded gasoline should not be used
under any circumstances. Damage to
the emission control components will
result.
c) In select models, the use of Ethanol
(E85) is also permissible. Models
capable of also operating with E85
are identified by a label on the fuel
filler flap reading 'Premium gasoline
or E85 only!'. Do not use Ethanol fuel
(E85) to operate any vehicle unless it
is specifically identified as Ethanol fuel
(E85) compatible. Damage to the engine
could occur if improper fuels are used.
Refer to the Operator's Manual for special
precaution.
d) The specified engine maintenance
jobs have to be performed completely
and at the required intervals. Correct
ignition timing and properly functioning
spark plugs for instance are important for
the service life of the catalysts.
G
Warning!
Please make sure you read the technical documentation, such as the Operator's Manual and
workshop information, before carrying out any maintenance work.

Emission System Maintenance

Failure to properly perform the specified
maintenance jobs may adversely affect
the emission control system on the
vehicle and reduce its service life.
e) The operation of the emission control
system must not be altered in any
way. Alterations are not permissible by
law. In addition, alterations may result
in damage to the catalysts, increased
fuel consumption, and impaired engine
running conditions.
f) Irregular engine running conditions
should be corrected immediately by an
authorized Mercedes-Benz Dealer. Such
irregular running conditions can influence
the proper function of the emission
control system.
If the "CHECK ENGINE" indicator lamp in
the instrument cluster illuminates when the
engine is running, it indicates a possible
malfunction of the engine management
system or emission control system.
We recommend that you have the
malfunction checked as soon as possible.
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