5-1
Chapter 5 ENGINE OIL
Recommended Engine Oil
Engine Oil Grade
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 or CH-4.
When using the CF class engine oil, it must be certi-
fied according to API service classification CF by 2009
and satisfied the following "Table of Recommended
Limit of Engine Oil Properties" (5-2).
When using the CH-4 class engine oil, the sulfur con-
tent of fuel must be 0.2 weight % or lower.
Fig. 5-1 Engine Oil Grade
Use the engine oil recommended in this manual only. Never use oil other than that specified in this manual.
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.
OILOIL
Class CH-4
API Service
Classification
API Service
Classification
Class CF
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