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 III. Conformance tests.

Characteristic

Requirements

Reference Table

Additional

Paragraphs

Acid assay

Viscosity , mm2/s (cSt),

at 40 �C

at 100 �C

Flash point, �C

Pour point, �C

Total acid number, mg KOH/g , maximum

Evaporation loss, percent by weight

Foaming, foam volume, mL, maximum

Thermal stability and corrosivity at 274 �C

Sediment

Trace metal content, ppm (mg/kg),

maximum

Corrosion and oxidative stability 72 hours

at 204 �C

Bearing deposits

Gear load carrying capacity

Bearing corrosion

4.3.1 Manufacturing tolerances. Finished turbine engine oils shall be of the same

composition and manufactured at the same plants and by the same methods as those used in the

qualified formulation.

4.3.1.1 Additives. Additives shall be of the same composition and manufactured at the

same plants and by the same methods as those used in the qualified formulation. Additive treat

rates for each manufactured batch shall not vary from those specified in table IV.