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Table 5-1 Table of Recommended Limit of Engine Oil Properties
Bubbling test
*2
Panel coking test
*3
*1 API CF grade oil certified in the year of 2009 or before.
*2 Temperature of test I (24°C [75.2°F]), Temperature of test II (93.5°C [200.3°F]), Temperature of test III (24°C
[75.2°F] after 93.5°C [200.3°F])
*3 Temperature of aluminum panel: 300°C [572°F] and 325°C [617°F], Temperature of engine oil: 100°C [212°F],
Splatter time: 15 seconds,
? Downtime: 45 seconds, Test time: 8 hours. The properties are the weight of solid product.
Selection of Oil Viscosity
Use the chart on the right to select the appropriate oil
viscosity according to the ambient temperature.
Excessively high oil viscosity causes power loss and
an abnormal rise of oil temperature, while excessively
low oil viscosity accelerates wear due to inadequate
lubrication, and also causes a decrease in engine out-
put.
Item
I
II
III
300°C
[572 °F]
325°C
[617 °F]
Unit
Recommended limit
10/0
mL
30/0
10/0
140 or lower
mg
300 or lower
-30
-20
-10
0
Temperature
[-21]
[-4]
[14]
[32]
°C [°F]
SAE10W
Engine oil
viscosity
SAE15W-40
Fig. 5-2 Selection of Oil Viscosity
Chapter 5 ENGINE OIL
Test method
JIS K 2518
ISO 6247
FED791-3462
10
20
30
40
50
[50]
[68]
[86]
[104]
[122]
SAE30
SAE40
5-3
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Troubleshooting
