MIL-PRF-17331L Lubricating oil intended for use in main and auxiliary turbines and gears, air compressors and certain hydraulic equipment as well as for general mechanical lubrication.
Qualification Numbers
Ser 05S/2019-028
Ser 05S/2020-160
Qualification Date
22 February 2019
4 May 2020
ISO 9001: 2015 Certification Number
C2021-00038
Military Symbol
2190 TEP
NATO Code
O-250
Shelf Life
24 Months from DOM
NATIONAL STOCK NUMBERS (NSN)
9150-01-368-7076 Oblong Gallon
9150-01-370-2583 5 Gallon Pail
9150-01-368-7075 55 Gallon Drum
9150-01-372-6915 Bulk
| Characteristics | Requirement | Typical Results | Test Method |
|---|---|---|---|
| Sulfur, % | Report | 0.00% | ASTM D129 |
| Acid number, mg KOH/g oil, max. | 0.3 | 0.26 | ASTM D974 |
| Corrosion (in presence of salt water) | None | Pass | ASTM D665 Procedure B |
| Copper Strip Corrosion test at 100 °C (212 °F), appearance, max. | Classification 1 | 1B | ASTM D130 |
| Oil Compatibility | Pass | Pass | Paragraph 4.4.5 |
| Water, percent, max. | 0.01% | 0.00% | ASTM D6304 |
| Gravity, API | Report | 31.4 | ASTM D1298 |
| Air release time, (minutes at 50°C, max.) | 20 | 6.1 | ASTM D2427 |
| Flash point, °C (°F), min. | 204°C (400°F) | 254 | ASTM D92 |
| Pour point, °C (°F), max. | -6°C (20°F) | -24°C (-11.2°F) | ASTM D97 |
| Viscosity | ASTM D445 | ||
| mm2/s at 4.4°C (40°F), max. | 870 | 755 | |
| mm2/s at 40°C (104°F) | 77 – 97 | 79 | |
| mm2/s at 100°C (212°F), min. | 8.0 | 9.7 | |
| Emulsion test, after 30 minutes settling time | ASTM D1401 | ||
| Oil layer/water layer/emulsion, max. | 41 / – / 3 | 41/39/0 | |
| Oxidation test, after 1000 hours: | ASTM D943 | ||
| Acid number, mg KOH/g, max. | 2.0 | 0.15 | ASTM D974 |
| Total sludge, mg, max. | 100 | 11.4 | ASTM D4310 |
| Total iron, mg, max. | 100 | 1.8 | ASTM D4310 |
| Total copper, mg, max. | 100 | 1.2 | ASTM D4310 |
| Oxidation by rotating pressure vessel, minutes to failure, min. | 200 | >500 | ASTM D2272 |
| Scuffing load capacity (FZG), failure load stage | Load Stage 9 | 10 | ASTM D5182 |
| Wear test, scar diameter, mm, max. | 0.33 | 0.26 | ASTM D4172 |
| Homogeneity, separation | None | None | Paragraph 4.4.1 |
| Foaming characteristics: | ASTM D892 | ||
| After blowing/after 10 minutes | |||
| Sequence I, mL, max. | 65/0 | 0/0 | |
| Sequence II, mL, max. | 65/0 | 0/0 | |
| Sequence III, mL, max. | 65/0 | 0/0 | |
| Cleanliness, mg/100 mL, max. | 2.5 | 0.6 | ASTM D4898 |
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