MIL-PRF-3150E
4.5.4 Low temperature stability. Fill a pour-point jar conforming to ASTM D97 to the
mark with test oil, stopper it, and subject the oil to the following sequence:
TABLE V. Low-temperature test sequence
TIME (hours + 10 minutes)
TEMPERATURE
-40 ± 3°C
24
25 ± 3°C
24
-18 ± 3°C
24
25 ± 3°C
24
At the completion of the test sequence, turn the pour-point jar to a horizontal position and
observe the rate of flow. Then, pour the oil into a standard viscosity tube conforming to ASTM
D446, figure A 2.4 and allow it to stand for one hour at 40 °C. Make consecutive viscosity
determinations in accordance with ASTM D445 until three such determinations yield values that
agree within 0.2 centistokes. Report the average values as the viscosity of the oil (for the
purpose of determining stability only). Then, compare the value to the initial viscosity of the oil
to determined conformance to 3.5.4.
4.5.5 Storage stability. Fill three 1-quart containers with the test oil to within
approximately 6 mm of the top of the container. Seal all three containers tightly. Store each of
the three sample containers at the temperatures and for the time periods indicated in TABLE VI:
TABLE VI. Storage-stability test sequence
SAMPLE #
TEMPERATURE
STORAGE PERIOD
(MONTHS)
-40 ± 3°C
st
1
3
-18 ± 3°C
1st
3
-18 ± 3°C
2nd
3
25 ± 3°C
nd
2
3
25 ± 3°C
3rd
3
54 ± 3°C
3rd
3
At the end of the 6-month storage period, examine and test the samples for conformance to the
requirements of 3.5.5.
4.6 Operating requirements verifications.
4.6.1 Physical properties. Physical properties shall be verified by the methods and values
listed in TABLE II.
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