Regulations and care
Lubricating Oil
A4.05.08.00
M20-M601C
en / 21.08.2001 BA020067 6/8
Ĺ
1.6 Limits:
1.6.1 Lubricating oil dilution by fuel
Lowering the flash point not below 180 °C (measured according to Penski-Martens DIN 51758) or
lowering the viscosity (compared with new oil) for SAE 40 (40 °C) by approx. 40 mm
2
/s (cSt), but
not below 120 mm
2
/s (cSt), and for SAE 30 (40 °C) by approx. 20 mm
2
/s (cSt), but not below
80 mm
2
s (cSt).
1.6.2 Alkalinity (TBN)
For heavy fuel operation, the total base number of the circulation oil of engines having a separate
cylinder lubrication must not fall below 15 mg KOH/g. If there is no separate cylinder lubrication, the
limit value will be 18 mg KOH/g.
If the engine is running on gas oil or MDO, the total base number must not fall below 50 % of the
value of the new oil.
If the base number has reached the lower limit and the other analysis values show a satisfactory oil
condition the alkalinity should be increased by the addition of new oil.
1.6.3 Water content
If the water content rises above 0.2 % the cause of the increase should be found and eliminated
immediately. The oil must be separated or it must be changed.
1.6.4 Contamination
When Caterpillar/MaK engines are running on heavy fuel, separators are specified to keep the oil
clean. In this way the content of insolubles can usually be kept well below 1 % by weight. If the con-
tent increases to above 1 % weight the oil must be separated more intensively.
The limit is 2 % by weight.
For gas oil operation as well the pentane or heptane insolubles must not exceed 2 % by weight.
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