Engine Oil; Recommended Engine Oil; Selection Of Oil Viscosity; Handling Engine Oil - Mitsubishi Heavy Industries L-Series Operation & Maintenance Manual

Recommended engine oil

Use only the engine oils recommended in this manual. Never use other oils.
The use of inappropriate or inferior oils will result in sticking of piston rings, seizure between piston and cylinder, or
premature wear of bearings and moving parts, and significantly shortens the service life of the engine.
Many oil standards, which are established through
special engine tests, are available to determine the
quality of oil depending on the engines to which they
will be applied and on operating conditions. Among
those standards, API (American Petroleum Institute)
service classifications are mostly used to classify
engine oils. SAE specifies the viscosity only, while the
API service classification indicates the quality level of

engine oil.

For engine lubrication oil, please use API service clas-
sification CF.

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 accelerates wear due to inadequate
lubrication, and also causes a decrease in engine out-
put due to leakage of combustion gas.

Handling engine oil

Before filling the engine with engine oil, stop the engine and make sure there are no open flames and other fire
hazards near the engine. Leaked or spilled oil on hot surfaces or electrical components can cause a fire. Wipe off
any spilled oil immediately and thoroughly. After filling, securely close the filler cap.
Never mix different brands of engine oil. Mixing different brands of engine oil may cause a chemical reaction of
additives in the engine oil that could degrade the engine oil quality.
When handling oil in greater than the legally specified quantities, be sure to have the work performed by a service
station in compliance with the law. When removing oil from the engine or oil can, use an oil pump. Do not suck oil
with the mouth to siphon it.
Be sure to close the cap on the oil can after use.
Keep oil in a well-ventilated area and out of direct sunlight.
Be sure to obtain the MSDS of the engine oil used and follow the instructions of the MSDS.
Chapter 5 ENGINE OIL
OIL
Class CF
API Service
Classification
Fig. 5-1 Recommended engine oil
Temperature
-30
°C [°F]
[-21]
Engine oil
viscosity
Fig. 5-2 Selection of oil viscosity
OIL
Class CH-4
API Service
Classification
-20 -10 0 10 20 30
[-4] [14] [32] [50] [68] [86] [104]
SAE10W
SAE30
SAE40
SAE15W-40
40 50
[122]
5-1