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Maintenance 533
can freeze and block the fuel supply. On markets
where water and particles are commonly found, a pre-
filter and water separator must be fitted.
Properties at low temperatures
The resistance of the fuel to low temperatures is
limited by its ability to pass a filter. The low
temperature requirements for fuel in various
geographical regions and seasons are defined in
national standards. Oil companies are responsible for
ensuring that low temperature properties are
acceptable at all times of the year.
Additives
It is always the oil companies who are responsible for
ensuring that the correct proportions of additives are
present in the fuel as regards ignition ability,
lubrication and low temperature properties. Volvo do
not allow using other fuel additives and other types of
fuels. Volvo do not allow addition of additives or other
fuels in the tank. The only exception is kerosene, see
the recommendation below.
Paraffin/Kerosene
Paraffin (kerosene) may only be used to improve low
temperature properties when necessary. This should be
done in consultation with the oil company that markets
the diesel fuel in question. Low temperature properties
are improved by about 2–3 °C per 10% addition of
paraffin. It is not permitted to add more than 20%
paraffin (kerosene), since the viscosity, density and
cetane rating fall, which reduces engine power and the
starting ability of the engine. In addition, the exhaust
emissions will increase.
Note that the max. limit for the mixture's lubricating
ability of 460 µm at 60 °C must never be exceeded.
For example, it is not permitted to mix paraffin with
Swedish environmentally classified fuels. If you
change fuel quality to environmentally classified fuels
or if you add paraffin, old deposits in the fuel tank and
fuel pipes can be dissolved and can accelerate filter
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