Mercedes-Benz CLS-Class, Maintenance Booklet

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malfunction of the engine management
system or emission control system.
We recommend that you have the
malfunction checked as soon as possible.
Emission Control System Caution -
Diesel Engines
Your Mercedes-Benz is equipped with
emission control devices to comply with
current diesel exhaust emission regulations
where the vehicle is certified for sale. Keep
your vehicle in proper operating condition by
following our recommended maintenance
instructions as outlined.
The following must be adhered to:
a) Diesel engines require ULTRA-LOW
SULFUR HIGHWAY DIESEL FUEL (15 ppm
SULFUR MAXIMUM) that meets the
ASTM D975 standard. Failure to use ULTRA-
LOW SULFUR HIGHWAY DIESEL FUEL (ULSD)
can severely damage the vehicle’s exhaust
after-treatment device.
b) Mercedes-Benz USA approves the use of
B5 (standard ULSD which may contain a
maximum of 5 % biodiesel) in all Common-rail
diesel Injection (CDI) and BlueTEC diesel
engines.
Diesel fuels containing a higher percentage of
biodiesel, e.g. B20, as well as straight
biodiesel may cause severe damage to your
engine/fuel system and are not approved.
Please ask your service station for further
information. If the B5 biodiesel blend is not
sufficiently labeled to clearly indicate that it
meets the ULSD standard, please do not use
it. The Mercedes-Benz limited warranty does
not cover damage caused by the use of fuels
not meeting Mercedes-Benz approved fuel
standards.
c) The specified engine maintenance jobs
have to be performed completely and at
the required intervals.
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.
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.
BlueTEC exhaust gas aftertreatment
with AdBlue
®
Models:
R
E 350 BlueTEC
R
R 350 BlueTEC
R
ML 350 BlueTEC
R
GL 350 BlueTEC
The BlueTEC exhaust gas aftertreatment
system requires a reducing agent (AdBlue
® )
in order to function properly. Maintaining the
level and condition of the AdBlue
®
agent is
part of the regular maintenance service work.
Under normal driving conditions one tankful
of AdBlue
®
agent should suffice until the next
maintenance service.
AdBlue
®
is a non-flammable, non-toxic,
colorless and odorless, water-soluble liquid.
! Only use AdBlue
®
complying with
ISO 22241. Do not add special additives to
AdBlue
® and do not dilute AdBlue ® with
water. Otherwise, the BlueTEC exhaust gas
aftertreatment system could be damaged.
Emission System Maintenance
9
Maintenance Booklet
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.
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