5-4
Chapter 5 ENGINE OIL
Service Limits of Engine Oil
Engine oil degrades through the use and by lapse of time.
The quality of engine oil and fuel, and the operating condition of the engine affect the deterioration of the engine oil.
Replace the engine oil in accordance with Chapter 7 MAINTENACE SCHEDULE. However, only if the operating
load is stable and engine oil analyze result allows, oil replacement interval may be changed.
Refer to the following table for the determination of engine oil performance. If any of the following properties
exceeds the limit, replace the engine oil with new oil.
Table 5-2 Engine Oil Properties
Properties
Standard
Test method
Kinetic Viscosity:
mm
2
/s [in
2
/s]
@100°C [212°F]
+30 % or less rate of change from
new oil
10 mm
2
/s [0.155 in
2
/s] or more
JIS K 2283
:2007
ISO 3107
ISO 2909
+30 % or less rate of change from
new oil
-20 % or less rate of change from
new oil
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
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
Compliance with ASTM D
893
Pentane insoluble coag-
ulated
Wt %
3.0 or less
Compliance with ASTM D
893
