Specification of lubricating oil (SAE 40) for heavy fuel operation (HFO)
General
The specific output achieved by modern diesel engines combined with the
use of fuels that satisfy the quality requirements more and more frequently
increase the demands on the performance of the lubricating oil which must
therefore be carefully selected.
Medium alkalinity lubricating oils have a proven track record as lubricants for
the moving parts and turbocharger cylinder and for cooling the pistons.
Lubricating oils of medium alkalinity contain additives that, in addition to
other properties, ensure a higher neutralization reserve than with fully com-
pounded engine oils (HD oils).
International specifications do not exist for medium alkalinity lubricating oils.
A test operation is therefore necessary for a corresponding long period in
accordance with the manufacturer's instructions.
Only lubricating oils that have been approved by MAN Diesel & Turbo may be
used. See table
Approved lubricating oils for HFO-operated MAN Diesel &
Turbo four-stroke engines.
Specifications
The base oil (doped lubricating oil = base oil + additives) must have a narrow
distillation range and be refined using modern methods. If it contains paraf-
fins, they must not impair the thermal stability or oxidation stability.
The base oil must comply with the limit values in the table below, particularly
in terms of its resistance to ageing:
Properties/Characteristics Unit Test method Limit value
Make-up – – Ideally paraffin based
Low-temperature behaviour, still flowable °C ASTM D 2500 –15
Flash point (Cleveland) °C ASTM D 92 > 200
Ash content (oxidised ash) Weight % ASTM D 482 < 0.02
Coke residue (according to Conradson) Weight % ASTM D 189 < 0.50
Ageing tendency following 100 hours of heating
up to 135 °C
– MAN Diesel &
Turbo ageing
oven
1)
–
Insoluble n-heptane Weight % ASTM D 4055
or DIN 51592
< 0.2
Evaporation loss Weight % - < 2
Spot test (filter paper) – MAN Diesel &
Turbo test
Precipitation of resins or
asphalt-like ageing products
must not be identifiable.
1)
Works' own method
Table 1: Target values for base oils
The prepared oil (base oil with additives) must have the following properties:
The additives must be dissolved in oil and their composition must ensure that
as little ash as possible is left over after combustion, even if the engine is pro-
visionally operated with distillate fuel.
Base oil
Medium alkalinity lubricating
oil
Additives
2017-07-11 - de
Specification of lubricating oil (SAE 40) for heavy fuel
operation (HFO)
D010.000.023-11-0001
General
MAN Diesel & Turbo
010.000.023-11
D010.000.023-11-0001 EN 1 (5)
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