MIL-PRF-21260E
2.4 Order of precedence. 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. The engine lubricating 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 4.1.1 and 6.4).
3.2 Design, materials, and manufacturing processes. Unless otherwise specified herein,
the design, materials, and manufacturing process selection is the prerogative of the contractor as
long as all articles submitted to the government fully meet the operating, interface, support and
ownership, and operating environment requirements specified.
3.2.1 Recycled, recovered, or environmentally preferable materials. Recycled,
recovered, or environmentally preferable materials should be used to the maximum extent
possible provided that the material meets or exceeds the operational and maintenance
requirements, and promotes economically advantageous life cycle costs.
3.3 Operating requirements. The engine lubricating oil shall meet all the operating
requirements as specified in 3.3.1 through 3.3.10.
3.3.1 Finished oil properties. The values, after the application of tolerances (see 4.1.1.1),
shall not exceed the maximum (max.) or fall below the minimum (min.) limits as specified in
table I.
TABLE I. Finished oil properties.
SAE Grade
SAE
SAE
SAE Grade
Property
10W
Grade 30
Grade 40
15W-40
Kinematic viscosity, Centistoke
(cSt):
@ 100 degrees Celsius (°C)
5.6
9.34
12.5
12.5
min.
max.
< 7.4
< 12.5
< 16.3
< 16.3
@ 40 °C 1/
X
X
X
X
7
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