Chapter 4 MAINTENANCE
4-4
Engine Oil
Recommended Engine Oil
Use class CD (recommended) and CF engine oils. Class CE and CF-4 engine oils are designed for diesel fuel
with a sulfur content of less than 0.5% and less than 0.2%, respectively. Since the sulfur content of most
Class-A heavy oil exceeds 0.5%, do not use Class CE or CF-4 engine oil when using Class-A heavy oil as
fuel.
Use of improper or inferior oil can cause excessive wear of bearings and moving parts, thus shortening the
engine life. It can also result in the sticking of piston rings and seizing of pistons in the cylinders, thus causing
major damage.
Selection of Oil Viscosity
Use the following chart to select the appropriate oil
viscosity according to the ambient temperature.
Excessively high oil viscosity causes power loss
and an abnormal rise of oil temperature, while
excessively low oil viscosity results in inadequate
lubrication and leakage of combustion gas that
cause increased wear and reduced output.
Recommended oil viscosity is SAE 15W-40 for all
seasons.
fig.4-3 Recommended oil viscosity according to air
temperature
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