Mercedes-Benz S350 TURBODIESEL Operator's Manual page 128

Diesel Fuels
Use only commercially available
vehicular diesel fuels No. 2 or No. 1
(ASTM D 975 No. 2-D or No. 1-D).
If diesel fuels are used with a sulphur
content exceeding 0.5% by weight, refer
to the "Engine Oil Change and Oil Filter
Service" section. Marine diesel fuel,
heating oil or the like must not be used.
At very low temperatures the fluidity of
No. 2 diesel fuel may become
insufficient due to paraffin separation.
For this reason the vehicle comes
equipped with a fuel preheater. The fuel
preheater only works with the vehicles
interior heater operating. It permits a
troublefree engine operation to a
temperature of approximately + 14°F (-
10°C) when using No. 2 diesel fuel.
To avoid malfunctions, No. 2 diesel
fuel of a lowered cloud point is
marketed during the cold Season.
At temperatures below + 14°F (-10°C)
use winterized or No. 1 diesel fuel only.
If not available, a
certain quantity of kerosene may be
added. Mixing only to be done within
the cars' fuel tank. Kerosene has to be
filled in before the diesel fuel.
Engine power may drop according to
the proportion of kerosene. For this
reason, keep percentage of kerosene
added to the minimum necessitated by
the ambient temperature.
The following table can be used as a
reference, if adding of kerosene
becomes necessary. The mixing ratios
shown refer to the total mixture.
Ambient temperature
+ 14°F to - 4°F ( -10°C to -20°C )
No. 2 Diesel Fuel: 70%
Kerosene: 30%
Ambient temperature
below - 4°F ( - 20°C )
No. 2 Diesel Fuel :50%
Kerosene: 50%
Even in extreme climatic conditions, the
maximum mixture ratio should not
exceed 50%.
Adding of kerosene to No. 1 diesel fuel
is not recommended even at low
temperatures.
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.
Warning!
Under no circumstances should
gasoline be mixed with diesel fuel.
Always follow basic safety rules when
working with any combustible
material. Do not fill the fuel tank or
mix diesel fuel and kerosene when
smoking, near an open flame or while
the vehicle's engine is running. An
explosion or fire can result.
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