SDMO R33C3, User And Maintenance Manual

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5-4
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.
The engine oil affects the engine oil quality to use, the engine operating condition and the quality of fuel.Analyze the
used oil, and understand the condition of oil deterioration and oil defacement. To determine the timing of engine oil
replacement, the stabiration of engine is required.
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.
Table 5-1 Engine oil properties
Properties Standard Test method
Viscosity
mm
2
/s [in
2
/s]
@100°C [212 °F]
-15% or more
+30% or less
of new oil
JIS K 2283
:2007
ISO 3107
ISO 2909
Total base number mgKOH/g
2.0 or more with hydrochloric acid
(HCL) method
1/2 of new oil or more with perchlo-
ric acid (PCA) method
JIS K 2501
:2003
ISO 3771
Total acid number mgKOH/g Up to +3.0 of new oil
JIS K 2501
:2003
ISO 3771
Water content Vol % 0.2 or less
JIS K 2275
:1996
ISO 9029
Flash point (open cup) °C [°F] 180 [356] or higher
JIS K 2265
:2007
ISO 3769
ISO 2719
Pentane insoluble Wt % 0.5 or less ASTM D 893
Pentane insoluble coag-
ulated
Wt % 3.0 or less ASTM D 893
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