8.3 Fuels and lubricants
8.3.1 Engine oil
8.3.1.1 Oil quality
The following engine oil specifications are permitted:
n Engine oils as per API-classification CF, CF-4, CG-4, CH-4 and
CI-4
For operation of an engine with high sulphur fuels we recom-
mended to use an engine oil of API-classification CF or higher with
a total base number of at least 10.
Avoid mixing engine oils.
8.3.1.2 Oil viscosity
Since engine oil changes its viscosity with the temperature, the
ambient temperature at the operating location of the engine is of
utmost importance when choosing the viscosity class (SAE-class).
The temperature data of the SAE-class always refer to fresh oils. In
travel operation engine oil ages because of soot and fuel residues.
This adversely affects the properties of the engine oil, especially
under low ambient temperatures.
Optimal operating conditions can be achieved by using the fol-
lowing oil viscosity chart as a reference:
Ambient temperature Oil viscosity
higher than 25 °C (77 °F) SAE 30
SAE 10W-30
SAE 15W-40
-10 °C to 25 °C (14 °F to 77 °F) SAE 10W-30
SAE 15W-40
below - 10 °C (14 °F) SAE 10W-30
8.3.1.3 Oil change intervals
If the oil change intervals are not reached over a period of one
year, the oil change should be performed at least 1 x per year, irre-
spective of the operating hours reached.
If the sulphur content in the fuel is higher than 0.5 %, the oil
change intervals must be halved.
Maintenance – Fuels and lubricants
D.ONE
105
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