Fuel
CAUTION
Petrol and alcohol must never be mixed
with diesel fuel.
Petrol and alcohol are not fuels for diesel
engines. Petrol and alcohol increase the
octane rating and lower the cetane rating
(ignition property). In addition, lubricating
properties are impaired significantly.
Petrol and alcohol can damage the
components included in the fuel system.
In addition, petrol and alcohol lower the
flashpoint, which affects the explosion
limit and fire safety. Due to the lowered
boiling point, there is also an increased
risk of boiling the fuel in the cylinder
head. Among other things, it can result a
vapour lock in the fuel system.
Diesel boosters
Many manufacturers of additives on the
market (so-called diesel boosters)
promise reduced fuel consumption and
improved lubricating properties. These
products have not had any demonstrable
effect on either fuel consumption or
lubricating properties.
Volvo is not liable for any warranty
claims following the use of such
additives. It is not Volvo policy to test
and evaluate such additives.
CAUTION
Diesel boosters must never be added to
the fuel.
HVO
Hydrogenated vegetable oils (HVO), is
made from renewable materials such as
vegetable and animals oil. HVO reduces
CO
2
emissions, depending on the raw
material.
HVO is a standardised product according
to the European standard CEN TS
15940 (EN15940).
HVO has the same properties as EN590,
in terms of storage life and cold-
resistance, only density differs. The two
fuels should not be mixed; changes
between fuels should only be done when
the fuel level is low.
Used oil
Used oil and two-stroke oil considerably
shorten the service life of the injection
equipment. In addition, the exhaust
emissions increase if these oils are used.
CAUTION
Used oil or two-stroke oil must never be
added to the fuel tank.
Aviation fuel and military
activities
It has been common for buses at airports
and in military operations to use aviation
fuel or different military grades of diesel.
When using such fuels, it is impossible to
ensure correct emission properties and
functionality. A sulphur content that is too
high can also damage the after treatment
systems so that they need replacing.
The following applies for the use of
aviation fuels:
• Lower energy content in the fuel
normally involves at least 5%
decreased power output and
increased fuel consumption.
• The sulphur requirement of all
aviation fuel specifications is well
above the requirement for Euro 4/5/6
fuel. Continuous operation on these
fuels can primarily damage the
aftertreatment system.
• The lubricity must be ensured, max
460 µm in HRR tests (ISO 12156) is
an absolute requirement.
• If military fuels are used, despite
previous points, the fuel must fulfil
the NATO F-63 specification.
08
Fuel and emission control
125
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