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MIL-PRF-6083 Hydraulic Fluid, Petroleum Base, For Preservation And OperationThis specification describes the characteristics and provides the requirements for one grade of petroleum base hydraulic fluid for use in the -54??C to +135??C temperature range \(see 6.1\). This fluid is rust inhibited and used both as a preservative for hydraulic systems and components as well as being an operational fluid. This hydraulic fluid will not be used for aircraft systems, aircraft ground support equipment, or the preservation of aircraft components. The hydraulic fluid is identified by Military Symbol OHT and NATO Symbol C-635.

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MIL-PRF-6083G
Test Method
Test Limits
Property
FED-
ASTM
STD-
Method
791
D2603(7)(8)
Shear Stability
See 3.4.8
Steel-on-Steel wear (average wear scar), mm in diameter (max)(9)
1.0
D4172
Storage Stability (24 ± 3°C for 12 months)
See 3.4.9
3465
Trace Sediment, mL (max)
0.005
D2273
2
Viscosity, mm /s
At -54C (max)
3300
At -40C (max)
700
D445
At 40C (min)
13.2
At 100C (min)
4.6
Water, mass % (max)
0.05
D6304
(1) There shall be no pitting, etching, or visible corrosion on the surface of any of the metals when
viewed under magnification of 20 diameters.
(2) A slight discoloration is permitted.
(3) Any corrosion (discoloration) produced on the surface of the copper shall be not greater than
No.3 of the ASTM D130 Copper Corrosion Standard.
(4) The container shall be thoroughly shaken immediately prior to withdrawing the sample. Two
determinations per sample are required. Each determination shall be made on 100mL portions of
the sample.
(5) Hexane shall be used instead of ozone depleting solvents.
(6) Use standard synthetic rubber NBR-L (as referenced in latest revision of SAE AMS3217/2) within
6 months of date of manufacture. Store rubber under 60F.
(7) Control Fluid is ASTM Reference Fluid B
(8) See 4.5.2
(9) Test Condition B
3.4.1 API Gravity. The API Gravity of the hydraulic fluid shall be determined and reported,
but not limited during qualification inspection. For conformance inspections, the API Gravity of the
hydraulic fluid shall be the value obtained during qualification inspection ±0.008.
3.4.2 Color. The hydraulic fluid shall be clear and transparent and shall not contain dye in
greater concentration than one (1) part of dye per 10,000 parts of fluid by weight and shall not be
darker than ASTM Color 5.0.
3.4.3 Compatibility. The hydraulic fluid shall be compatible in all concentrations with
each of the fluids approved under this specification. The hydraulic fluid shall be miscible with
MIL-PRF-5606, MIL-PRF-46170, MIL-PRF-83282, and MIL-PRF-87257 fluids in all proportions
from -54C to 135C. No formation of gums, sludge, or insoluble material shall occur. (See 4.5.1)
3.4.4 Corrosion Protection (Humidity Cabinet). The hydraulic fluid shall protect specially
prepared steel test panel surfaces (sand blasted and polished) to the extent that no more than three (3)
corrosion dots, no one of which is larger than 1millimeter (mm) in diameter, occur on any of the
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