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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

3.3 Chemical and physical requirements. All classifications of the lubricating oil shall

conform to the requirements specified in table I.

TABLE I. Physical, chemical, and performance requirements.

Characteristic

Requirement

Test Method

Reference

Paragraph

Acid assay

Report

FED-STD-791,

3.2.1

Method 3500

Viscosity, mm2/s (cSt) at -40 �C , maximum

13,000

ASTM D2532

Percent change after 72 hours at -40 �C,

maximum

�6

4.4.1

Viscosity, mm2/s (cSt),

ASTM D445

at 100 �C

4.90 - 5.40

at 40 �C, minimum

23.0

Flash point, minimum

246 �C

ASTM D92

Pour point, maximum

-54 �C

ASTM D97 or

ASTM D5950

ASTM D5985

ASTM D5949

Total acid number, mg KOH/g, maximum

SAE ARP5088

STD, C/I, HTS classes

1.00

EE class

0.75

Evaporation loss, percent by weight, 6.5 hours

ASTM D972

4.4.2

at 204 �C, maximum

Foaming, foam volume, mL, maximum

ASTM D892

5 minutes aeration at 24 �C

1 minute settling at 24 �C

nil

5 minutes aeration at 93.5 �C

1 minute settling at 93.5 �C

nil

5 minutes aeration at 24 �C (after test at

93.5 �C, above)

1 minute settling at 24 �C

nil