6.1.2.1 Pilot fuel oil
The optimum engine performance is achieved with fuel fulfilling the requirements in table
below. However, normal operation of the engine is fully possible with a fuel according to the
ISO 8217:2017(E) with a possible impact on the engine efficiency. In case of questions regarding
the engine performance please contact Wärtsilä.
Table 6-2 Pilot fuel oil
Test method
ref.
ISO-F-
DMB
ISO-F-
DMZ
ISO-F-
DMA
UnitProperty
ISO 4264505050-Cetane index, min.
6.1.2.2 Light fuel oil operation (distillate)
The fuel specification is based on the ISO 8217:2017(E) standard and covers the fuel grades
ISO-F-DMX, DMA, DFA, DMZ, DFZ, DMB and DFB.
The distillate grades mentioned above can be described as follows:
● DMX: A fuel which is suitable for use at ambient temperatures down to –15 °C without
heating the fuel. Especially in merchant marine applications its use is restricted to lifeboat
engines and certain emergency equipment due to reduced flash point.
● DMA: A high quality distillate, generally designated MGO (Marine Gas Oil) in the marine
field.
● DFA: A similar quality distillate fuel compared to DMA category fuels but a presence of
max. 7,0% v/v of Fatty acid methyl ester (FAME) is allowed.
● DMZ: A high quality distillate, generally designated MGO (Marine Gas Oil) in the marine
field. An alternative fuel grade for engines requiring a higher fuel viscosity than specified
for DMA grade fuel.
● DFZ: A similar quality distillate fuel compared to DMZ category fuels but a presence of
max. 7,0% v/v of Fatty acid methyl ester (FAME) is allowed.
● DMB: A general purpose fuel which may contain trace amounts of residual fuel and is
intended for engines not specifically designed to burn residual fuels. It is generally
designated MDO (Marine Diesel Oil) in the marine field.
● DFB: A similar quality distillate fuel compared to DMB category fuels but a presence of
max. 7,0% v/v of Fatty acid methyl ester (FAME) is allowed.
For maximum fuel temperature before the engine, see the Installation Manual.
Table 6-3 Light fuel oils
Test meth-
od(s) and ref-
erences
Category ISO-F
LimitUnitCharacteristics
DFBDMBDFZDMZDFADMADMX
ISO 3104
11,006,0006,0005,500Max
mm
2
/s
a)
Kinematic viscosity at 40 °C
2,0003,0002,000
1,400
i)
Min
ISO 3675 or
ISO 12185
900,0890,0890,0-Maxkg/m³Density at 15 °C
ISO 426435404045Min
Cetane index
j)
6-2 DBAD209883
Wärtsilä 46DF Product Guide6. Fuel System
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