Mercedes-Benz 2009 SLK 300, Operator'S Manual

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Fuels, coolants, lubricants etc.
356
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 manufactur-
ers is carbon build-up caused by gasoline.
Mercedes-Benz recommends only the use of
quality gasoline containing additives that pre-
vent the build-up of carbon deposits.
After an extended period of using fuels with-
out such additives carbon deposits can build
up, especially on the intake valves and in the
combustion area, leading to engine perform-
ance problems such as:
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Warm-up hesitation
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Unstable idle
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Knocking/pinging
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Misfire
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Power loss
In areas where carbon deposits may be
encountered due to lack of availability of gas-
oline which contains these additives, Mer-
cedes-Benz recommends the use of additives
approved by us for use on Mercedes-Benz
vehicles.
Contact an authorized Mercedes-Benz Center
or visit www.mbusa.com (USA only) for a list-
ing of approved product(s). Follow directions
on product label.
Do not blend other fuel additives with fuel.
This only results in unnecessary cost and may
be harmful to the engine operation.
! Damage or malfunction resulting from
poor fuel quality or from blending additional
fuel additives other than those tested and
approved by us for use on Mercedes-Benz
vehicles are not covered by the Mercedes-
Benz Limited Warranty or by any pre-owned
or Extended Limited warranties.
Coolants
The engine coolant is a mixture of water and
anticorrosion/antifreeze, which provides:
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Corrosion protection
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Freeze protection
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Boiling protection (by increasing the boiling
point)
The cooling system was filled at the factory
with a coolant providing freeze protection to
approximately -35‡ (-37†) and corrosion
protection.
! Add premixed coolant solution only. Add-
ing water and MB 325.0 Anticorrosion/
Antifreeze separately from each other,
could cause engine damage not covered by
the Mercedes-Benz Limited Warranty.
If the antifreeze mixture is effective to -35‡
(-37†), the boiling point of the coolant in the
pressurized cooling system is reached at
approximately 266‡ (130†).
The coolant solution must be used year round
to provide the necessary corrosion protection
and increase boil-over protection. Refer to
the Maintenance Booklet for replacement
interval.
Coolant system design and coolant used
determine the replacement interval. The
replacement interval published in the Main-
tenance Booklet is only applicable if
MB 325.0 Anticorrosion/Antifreeze solution
or other Mercedes-Benz approved products
of equal specification are used to renew the
coolant concentration or bring it back up to
the proper level.
For information on other Mercedes-Benz
approved products of equal specification,
contact an authorized Mercedes-Benz Center
or visit www.mbusa.com (USA only).
To provide important corrosion protection,
the solution must be at least 50% anticorro-
Technical data