Service Limits Of Engine Oil; Table 5-1 Engine Oil Properties - Mitsubishi S4S-DT Operation & Maintenance Manual

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.
Properties
Viscosity
Total base number
Total acid number
Water content
Flash point (open cup)
Pentane insoluble
Pentane insoluble coag-
ulated
5-4

Table 5-1 Engine oil properties

2 2
mm /s [in /s]
@100°C [212 °F]
2.0 or more with hydrochloric acid
mgKOH/g
1/2 of new oil or more with perchlo-
mgKOH/g
Vol %
°C [°F]
Wt %
Wt %
Standard
+30% or less
of new oil
-15% or more
(HCL) method
ric acid (PCA) method
Up to +3.0 of new oil
0.2 or less
180 [356] or higher
0.5 or less
3.0 or less
Test method
JIS K 2283
:2007
ISO 3107
ISO 2909
JIS K 2501
:2003
ISO 3771
JIS K 2501
:2003
ISO 3771
JIS K 2275
:1996
ISO 9029
JIS K 2265
:2007
ISO 3769
ISO 2719
ASTM D 893
ASTM D 893