Approx. BN
of fresh oil
(mg KOH/g oil)
Engines/Operating conditions
40 Under unfavourable operating conditions 23/30A, 28/32A and 28/32S, and where the corre-
sponding requirements for the oil service life and washing ability exist.
In general 16/24, 21/31, 27/38, 32/40, 32/44CR, 32/44K, 40/54, 48/60 as well as 58/64 and
51/60DF for exclusively HFO operation providing the sulphur content is over 1.5 %.
50 32/40, 32/44CR, 32/44K, 40/54, 48/60 and 58/64, if the oil service life or engine cleanliness is
insufficient with a BN number of 40 (high sulphur content of fuel, extremely low lubricating oil
consumption).
Table 3: Base number to be used for various operating conditions
To comply with the emissions regulations, the sulphur content of fuels used
nowadays varies. Fuels with low-sulphur content must be used in environ-
mentally-sensitive areas (e.g. SECA). Fuels with higher sulphur content may
be used outside SECA zones. In this case, the BN number of the lube oil
selected must satisfy the requirements for operation using fuel with high-sul-
phur content. A lube oil with low BN number may only be selected if fuel with
a low sulphur content is used exclusively during operation.
However, the practical results demonstrate that the most efficient engine
operation is the factor ultimately determining the permitted additive content.
In engines with separate cylinder lubrication systems, the pistons and cylin-
der liners are supplied with lubricating oil via a separate lubricating oil pump.
The quantity of lubricating oil is set at the factory according to the quality of
the fuel to be used and the anticipated operating conditions.
Use a lubricating oil for the cylinder and lubricating circuit as specified above.
Multigrade oil 5W40 should ideally be used in mechanical-hydraulic control-
lers with a separate oil sump, unless the technical documentation for the
speed governor specifies otherwise. If this oil is not available when filling,
15W40 oil may be used instead in exceptional cases. In this case, it makes
no difference whether synthetic or mineral-based oils are used.
The military specification applied for these oils is NATO O-236.
Experience with the drive engine L27/38 has shown that the operating tem-
perature of the Woodward controller UG10MAS and corresponding actuator
for UG723+ can reach temperatures higher than 93 °C. In these cases, we
recommend using synthetic oil such as Castrol Alphasyn HG150.
Hydraulic oil HLP 46 (DIN 51502) or ISO VG 46 (DIN 51519) must be used
according to the specification DIN 51524-2. Mixing hydraulic oils from differ-
ent manufacturers is not permitted.
The use of other additives with the lubricating oil, or the mixing of different
brands (oils by different manufacturers), is not permitted as this may impair
the performance of the existing additives which have been carefully harmon-
ised with each another, and also specially tailored to the base oil.
Most of the oil manufacturers are in close regular contact with engine manu-
facturers, and can therefore provide information on which oil in their specific
product range has been approved by the engine manufacturer for the partic-
ular application. Irrespective of the above, the lubricating oil manufacturers
are in any case responsible for the quality and characteristics of their prod-
ucts. If you have any questions, we will be happy to provide you with further
information.
Operation with low-sulphur
fuel
Cylinder lubricating oil
Oil for mechanical/hydraulic
speed governors
Hydraulic oil for engines with
VVT controller
Lubricating oil additives
Selection of lubricating oils/
warranty
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 3 (5)
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