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Advice
Diesel fuel
Please note the information on the inside of
the fuel t
ank flap.
We recommend the use of diesel fuel which
complies to European standard EN 590. If
diesel fuel which meets European standard
EN 590 is not available, the Cetane number
(CZ) must, at minimum, be 51. If the engine
is equipped with a particulate filter, the sul-
phur content of the fuel must be below 50
parts per million.
Winter-grade diesel
Summer fuel becomes thicker in winter and it
is more difficult to start the engine. For this
reason, petrol stations in some countries al-
so offer winter diesel with improved fluidity
when cold (winter-grade diesel).
CAUTION
●
The vehic
le is not designed for the use of
FAME fuel (biodiesel). The fuel system would
be damaged if you used biodiesel.
●
Do not mix fuel additives, the so-called
“thinners”, petrol or similar additives with
diesel fuel.
●
If poor-quality diesel fuel is used, it may be
necessary to drain the fuel filter more fre-
quently than is specified in the Maintenance
Programme. We recommend having this done
by a specialised workshop. If water is allowed
to collect in the filter, this can cause engine
perform
ance problems.
Natural gas
Natural gas can be compressed or in liquid
form, ad
dition to others.
Liquefied natural gas (LNG) is the result of
heavy cooling of natural gas. Therefore its
volume is considerably reduced compared
with compressed natural gas (CNG). In vehi-
cles with a natural gas engine, liquefied nat-
ural gas cannot be directly refilled, as the gas
would expand excessively in the vehicle gas
tank.
Therefore, vehicles with a natural gas engine
must only be refuelled using compressed
natural gas ›››
.
Nat
ur
a
l gas quality and consumption
Natural gas is divided into the groups H and
L depending on its quality.
Gas type H has a superior heating power and
inferior nitrogen and carbon dioxide content
than type L. The higher the heating power of
the natural gas, the lower the consumption
will be.
However, the heating power and the propor-
tion of nitrogen and carbon dioxide can fluc-
tuate within the quality groups. Therefore, ve-
hicle consumption can also vary when using
a single type of gas only.
The engine management automatically
adapts to the natural gas used according to
its quality. Therefore, different quality gases
can be mixed in the tank, without the need
for comprehensive draining before applying a
different quality gas.
Updated information relating to natural gas
quality is displayed on the instrument panel
›››
page 37.
Natural gas and safety
If you can smell gas or suspect that there is a
leak ›››
:
●
Stop the vehicle immediately.
●
Switch the ignition off.
●
Open the doors to appropriately ventilate
the
v
ehic
le.
●
Extinguish cigarettes immediately.
●
Move away from the vehicle or switch off
objects that may cause sparks or a fire.
●
If you continue to smell gas, do not contin-
ue driving!
●
Seek specialist assistance. Have the fault
repaired.
Regular checks of the natural gas system
The natural gas tanks may be damaged or
corroded by external factors. The walls of the
260
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