Specification of lubricating oil (SAE 40) for operation with MGO/MDO and
biofuels
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.
Doped lubricating oils (HD oils) have a proven track record as lubricants for
the drive, cylinder, turbocharger and also for cooling the piston. Doped lubri-
cating oils contain additives that, amongst other things, ensure dirt absorp-
tion capability, cleaning of the engine and the neutralisation of acidic com-
bustion products.
Only lubricating oils that have been approved by MAN Diesel & Turbo may be
used. These are listed in the tables below.
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 following limit values, 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 base oil to which the additives have been added (doped lubricating oil)
must have the following properties:
The additives must be dissolved in the oil, and their composition must ensure
that as little ash as possible remains after combustion.
Base oil
Compounded lubricating oils
(HD oils)
Additives
2017-07-13 - de
Specification of lubricating oil (SAE 40) for operation with
MGO/MDO and biofuels
D010.000.023-07-0001
General
MAN Diesel & Turbo
010.000.023-07
D010.000.023-07-0001 EN 1 (5)
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