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.
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.
There are no prescribed oil change intervals for MAN Diesel & Turbo medium
speed engines. The oil properties must be analysed monthly. As long as the
oil properties are within the defined threshold values, the oil may be further
used. See table Limit values for used lubricating oil.
The quality of the oil can only be maintained if it is cleaned using suitable
equipment (e.g. a separator or filter).
Due to current and future emission regulations, heavy fuel oil cannot be used
in designated regions. Low-sulphur diesel fuel must be used in these regions
instead.
If the engine is operated with low-sulphur diesel fuel for less than 1,000 h, a
lubricating oil which is suitable for HFO operation (BN 30 – 55 mg KOH/g)
can be used during this period.
If the engine is operated provisionally with low-sulphur diesel fuel for more
than 1,000 h and is subsequently operated once again with HFO, a lubricat-
ing oil with a BN of 20 must be used. If the BN 20 lubricating oil from the
same manufacturer as the lubricating oil is used for HFO operation with
higher BN (40 or 50), an oil change will not be required when effecting the
changeover. It will be sufficient to use BN 20 oil when replenishing the used
lubricating oil.
If you wish to operate the engine with HFO once again, it will be necessary to
change over in good time to lubricating oil with a higher BN (30 – 55). If the
lubricating oil with higher BN is by the same manufacturer as the BN 20 lubri-
cating oil, the changeover can also be effected without an oil change. In
doing so, the lubricating oil with higher BN (30 – 55) must be used to replen-
ish the used lubricating oil roughly 2 weeks prior to resuming HFO operation.
Tests
A monthly analysis of lube oil samples is mandatory for safe engine opera-
tion. We can analyse fuel for customers in the MAN Diesel & Turbo Prime-
ServLab.
Lubricating oil additives
Selection of lubricating oils/
warranty
Oil during operation
Temporary operation with
gas oil
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 3 (5)
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