MIL-DTL-83767C
3.5 Corrosion and oxidation stability. The oil shall comply with the following requirements
when tested as specified in table III of paragraph 4.4.2.
3.5.1 Corrosion (72-hour test). The change in weight of copper, steel, aluminum alloy,
magnesium alloy, and cadmium shall not exceed ±0.2 milligrams per square centimeter of surface
when subjected to the action of the oil for 72 hours at 250 ºF (121 ºC). There shall be no pitting,
etching, or visible corrosion on the surface of any of the metals when viewed under a
magnification of 20 diameters.
3.5.2 Oxidation. The oil shall not have changed more than -5 percent or +15 percent from
the original viscosity in centistokes at 104 ºF (40.0 ºC) after the oxidation-corrosion test. The
total acid number shall not have increased by more than 1.0 after oxidation and there shall be no
evidence of separation of insoluble materials or gumming of oils.
3.6 Foaming characteristics. The foaming characteristics of the lubricating oil shall not
exceed the limits indicated in table II.
TABLE II. Foaming characteristics of finished oil.
Foaming tendency
Foam stability
(max. foam volume in
(max. foam volume in
mL at end of 5-minute
mL at end of 10-minute
Test
blowing period)
settling period)
At 75 ºF (24 ºC)
250
10
At 200 ºF (93.5 ºC)
75
0
At 75 ºF (24 ºC) after test
250
0
at 200 ºF (93.5 ºC)
4. VERIFICATION
4.1 Classification of inspection. The inspection requirements specified herein are
classified as conformance inspection (see 4.4).
4.2 Lot. For the purposes of inspection, bulk lot and packaged lot sizes are as follows:
4.2.1 Bulk lot. A bulk lot is an indefinite quantity of homogeneous mixture of one type
of oil offered for acceptance in a single isolated container or manufactured in a single plant run
(not exceeding 24 hours) through the same processing equipment with no change in the
ingredient materials.
4.2.2 Packaged lot. A packaged lot is an indefinite number of 55-gallon drums or
smaller unit containers of identical size and type filled with a homogeneous mixture of material
form one isolated container or filled with a homogeneous mixture of material manufactured in a
single plant run (not exceeding 24 hours) through the same processing equipment with no change
in ingredient materials.
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