MIL-PRF-6086F
2.3 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a
conflict between the text of this document and the references cited herein, the text of this document takes
precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a
specific exemption has been obtained.
3. REQUIREMENTS
3.1 Qualification. Any oil furnished under this specification shall be products that are authorized
by the qualifying activity for listing on the applicable qualified products list before contract award (see 4.3
and 6.4).
3.1.1 Requalification. Requalification will be required if there is a change in the base stock
source, refining treatment or additives. A minor change in the fluid formulation may be made without
requalification, but only after notification to, and approval by, the qualifying activity. The qualifying activity
may, at its discretion, waive complete requalification or may require only partial requalification testing to
determine the significance and acceptability of the proposed formulation change.
3.2 Materials. The oil shall consist of base stock oil mixed with a suitable load-carrying additive.
The additive shall not be corrosive or cause excessive foaming, and shall be completely compatible with
the base stock. The oil shall be clear and free of visible water, suspended matter, dirt, sediment or other
impurities when observed at room temperature (25°C ±2°C). Recycled constituent materials shall not be
used.
3.3 Properties. The physicochemical properties of the finished gear oil shall be as specified in
Table I and 3.4.1
TABLE I. Physicochemical properties.
Property
Requirements,
Requirements,
Units of
Test method
grade L
grade M
measurement
2
Viscosity
23-34
60-82
mm /s at 37.8°C
ASTM D445
Viscosity index
80
80
(minimum)
ASTM D2270
Flash point
137.8
154.5
°C (minimum)
ASTM D92
Pour point
- 40
- 28.9
°C (maximum)
ASTM D97
Load wear index
40
40
kg (minimum)
ASTM D2783
Precipitation number
0.1
0.1
mL (maximum)
ASTM D91
Acid number
1.0
1.0
mg KOH/g (maximum)
ASTM D974
ASTM color
8
8
(maximum)
ASTM D1500
Foaming Characteristics
ASTM D892
(tendency, stability)
mL (maximum)
5, 0
5, 0
Sequence I
mL (maximum)
20, 0
20, 0
Sequence II
mL (maximum)
5, 0
5, 0
Sequence III
3
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