Chapter 4
MAINTENANCE
4-4
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.
Handling Engine Oil
Before pouring engine oil into the engine, stop the engine and make sure there are no flames near the engine.
Oil leaked or spilled onto hot surfaces or electrical components can cause a fire. Wipe any spilled oil immedi-
ately and thoroughly.
After pouring engine oil, close filler cap surely.
Never mix different brands of engine oil. Mixing different brands of engine oil may cause a chemical reaction
by the additives in the engine oil that could degrade the engine oil quality.
If oil of more than the legally specified amount must be handled, be sure to have the work performed by a ser-
vice station in compliance with the legal regulations.
Use an oil pump to remove oil from the engine or oil can. Do not use a hose to siphon with the mouth.
Be sure to close the cap on the oil can after use.
Keep oil in a well-ventilated place and out of direct sunlight.
Be sure to obtain the MSDS (material safety data sheet) of the engine oil used and follow the instructions.
fig.4-3 Recommended oil viscosity according to air
temperature
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