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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.
Requirement
Characteristic
Test Method
Reference
STD and
HTS and
Paragraph
C/I Classes  EE Classes
Corrosion and oxidative stability
ASTM D4636,
Alternate
a) 72 hours at 175 °C
Procedure 2
Viscosity, percent change
-5 to +15
0 to +10
Total acid number change, mg KOH/g,
2.0
1.0
maximum
Metal weight change, mg/cm2,
maximum
±0.2
±0.2
Steel
±0.2
±0.2
Silver (Ag)
±0.2
±0.2
Aluminum (Al)
±0.2
±0.2
Magnesium (Mg)
±0.4
±0.4
Copper (Cu)
---
---
Titanium (Ti)
50
25
Sludge content (filtered through 10 µm),
mg/100 mL of oil, maximum
Corrosion and oxidative stability
ASTM D4636,
Alternate
b) 72 hours at 204 °C
Procedure 2
Viscosity, percent change
-5 to +25
0 to +22.5
Total acid number change, mg KOH/g,
maximum
3.0
2.0
Metal weight change, mg/cm2,
maximum
±0.2
±0.2
Steel
±0.2
±0.2
Silver (Ag)
±0.2
±0.2
Aluminum (Al)
±0.2
±0.2
Magnesium (Mg)
±0.4
±0.4
Copper (Cu)
---
---
Titanium (Ti)
Sludge content, (filtered through 10 µm),
50
25
mg/100 mL oil, maximum
9



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