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 C/I HTS and EE

Paragraph

Classes

Corrosion and oxidative stability

ASTM

D4636,

c) 72 hours at 218 �C

Alternate

Procedure 2

Viscosity, percent change

120

60 max

Total acid number change, mg KOH/g,

maximum

10 max

Metal weight change, mg/cm2, maximum

�0.2

Steel

�0.2

Silver (Ag)

�0.2

Aluminum (Al)

---

Magnesium (Mg)

---

Copper (Cu)

�0.2

Titanium (Ti)

Sludge content (filtered through 10 �m),

mg/100 mL oil, maximum