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.
Limit value Procedure
Viscosity at 40 °C 110 – 220 mm²/s ISO 3104 or ASTM D 445
Base number (BN) at least 50 % of fresh oil ISO 3771
Flash point (PM) At least 185 °C ISO 2719
Water content max. 0.2 % (max. 0.5 % for brief peri-
ods)
ISO 3733 or ASTM D 1744
n-heptane insoluble max. 1.5 % DIN 51592 or IP 316
Metal content depends on engine type and operat-
ing conditions
–
Guide value only
Fe
Cr
Cu
Pb
Sn
Al
max. 50 ppm
max. 10 ppm
max. 15 ppm
max. 20 ppm
max. 10 ppm
max. 20 ppm
–
Table 4: Limit values for used lubricating oil
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.
Oil during operation
Temporary operation with
gas oil
Specification of lubricating oil (SAE 40) for heavy fuel
operation (HFO)
D010.000.023-11-0001
General
2017-07-11 - de
010.000.023-11
MAN Diesel & Turbo
4 (5) D010.000.023-11-0001 EN
To Next Page
Loading...
Need help?
General
