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MIL-PRF-23699 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base, Nato Code Numbers: O-152, O-154, O-156, And O-167This specification covers four classes of gas turbine engine lubricating oils, primarily used for aircraft engines, which have a nominal viscosity of 5 centistokes at 100 ┬░C and which are typically made with neopentyl polyol ester base stocks. This oil is identified by NATO Code Numbers O-152, O-154, O-156, and O-167.

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MIL-PRF-23699G
TABLE I. Physical, chemical, and performance requirements - Continued.
Characteristic
Requirement
Test Method
Reference
Paragraph
Thermal stability and corrosivity at 274 °C
FED-STD-791,
Viscosity change, maximum
5.0 percent
Method 3411
Total acid number change, mg KOH/g,
6.0
maximum
+/- 4.0 mg/cm2
Weight of metal change, maximum
Sediment
FED-STD-791,
Visual undissolved water
none
Method 3010
Sediment through 1.2 micron filter,
10 mg/l
maximum
Total ash content, maximum
1 mg/l
Shear stability, viscosity loss at 40 °C,
maximum
4 percent
ASTM D2603
Trace metal content by RDE-AES, ppm
ASTM D6595
(mg/kg), maximum
2
Aluminum (Al)
2
Iron (Fe)
2
Chromium (Cr)
1
Silver (Ag)
1
Copper (Cu)
11
Tin (Sn)
2
Magnesium (Mg)
2
Nickel (Ni)
2
Titanium (Ti)
10
Silicon (Si)
2
Zinc (Zn)
2
Lead (Pb)
3
Molybdenum (Mo)
2
Boron (B)
Trace metal content ICP-AES, ppm
(mg/kg), maximum
ASTM D5185
Aluminum (Al)
2
Iron (Fe)
2
Chromium (Cr)
2
1
Silver (Ag)
1
Copper (Cu)
4
Tin (Sn)
2
Magnesium (Mg)
2
Nickel (Ni)
2
Titanium (Ti)
Silicon (Si)
10
Zinc (Zn)
2
2
Lead (Pb)
3
Molybdenum (Mo)
Boron (B)
2
8



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