Emission System Maintenance
Emission Control System Caution –
Gasoline Engines
Your 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 unlea-
ded gasoline with an Octane Rating of at least 87
(as displayed on the pump). Damage to the
engine could occur if incorrect fuel is 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) 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. Failure to
properly perform the specified maintenance
jobs may adversely affect the emission control
system on the vehicle and reduce its service life.
d) 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.
e) 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.
Description of maintenance work for
the exhaust system
The composition of exhaust emissions is influenced not only by the exhaust gas aftertreatment system, but also by various engine parts
and their settings.
Maintenance of the exhaust system must therefore include these engine parts. Some maintenance jobs are actually only tests. They are
important, however, because they allow early
detection of discrepancies which can later lead
to increased exhaust emissions. It is generally
less costly to adjust deviations of this sort
immediately than to wait until they incur high
repair costs. The maintenance intervals have
been determined so that the vehicle, under normal operating conditions, should operate properly between maintenance services.
Changing the engine oil and filter
Replace the engine oil and oil filter according to
the specified maintenance intervals. If oil consumption should increase, determine the cause
and take necessary corrective steps. Do not
reset the service interval display if the oil level is
topped up or changed outside the specified
maintenance intervals.
Replacing the engine air-filter element
The engine air-filter element must be replaced
according to the specified maintenance intervals when dust conditions are normal. Under
severe dust conditions the engine air-filter element should be replaced more frequently. Clean
engine air-filter cover and housing prior to
removal of engine air-filter element.
Replacing the fuel filter
Replace the fuel filter according to the specified
maintenance intervals.
Check engine poly-V-belt condition
The poly-V-belt is subject to wear and aging. It
must be checked for cracks and wear according
Description of maintenance work for the exhaust system
5
Maintenance Booklet