Mitsubishi S6B Service Manual

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Chapter 5 ENGINE OIL
Service limits of engine oil
Engine oil degrades through the use and by lapse of time.
To determine the timing of engine oil replacement, analyze the used oil, and understand the condition of oil deterio-
ration and oil defacement. It is also required to compare the oil analysis results and the engine analysis results
including inside contamination and wear condition of engine, and to consider the engine operating condition.
Refer to the following table for the determination of engine oil performance degradation. If any of the following devi-
ate the limit, replace the engine oil with new oil.
Engine oil analysis service
For a long term service life of engine, Mitsubishi Heavy Industries, Ltd. offers an engine oil analysis service.
The service includes special oil sampling tools, the sample oil analysis and result data.
The engine oil analysis service provides the followings:
The quantity of fine metal powder in engine oil due to abrasion, by which worn parts can be located.
Water, LLC or salt that should not be in engine oil can be detected.
Engine oil deteriorating conditions, by which appropriate engine oil renewal intervals, operating conditions, proper
inspection and maintenance schedule can be planned.
The engine oil analysis service can diagnose the internal condition of the engine, which is necessary when disas-
sembling the engine. It is highly recommended to take advantage of our engine oil analysis service so that you can
learn the engine condition before any malfunction occurs to the engine.
Table 5-1 Engine oil properties
Properties Standard value Test method
Viscosity
mm
2
/s@100°C
[212°F]
-15% or more
+30% or less
of new oil JIS K 2283
Total base number mgKOH/g
2.0 or more with hydrochloric acid (HCL)
method
1/2 of new oil or more with perchloric
acid (PCA) method
JIS K 2501
Total acid number mgKOH/g Up to +3.0 of new oil JIS K 2501
Water content Vol % Maximum 0.2 JIS K 2275
Flash point (open cup) °C [°F] Over 180 [356] JIS K 2265
Pentane insoluble Wt % Maximum 0.5 Comply with ASTM D893
Pentane insoluble coag-
ulated
Wt % Maximum 3.0 Comply with ASTM D893

Mitsubishi S6B Specifications

General

Brand	Mitsubishi
Model	S6B
Category	Engine
Language	English