MIL-PRF-26087C
6.1 Intended use. The lubricating oil covered by this specification is intended for use in high
compression reciprocating air compressors for application on military unique items. The
requirements of the lubricants, which impact the performance of the lubricants, have not been
found commercially available (i.e., either the item is produced solely from a military specification
or industry specifications did not meet the requirements).
6.1.1 Grade I. Grade I, a medium weight lubricant, is suitable for use in high compression
reciprocating air compressors at ambient temperatures ranging from -15° C to 54.4° C (5° F to
130° F).
6.1.2 Grade II. Grade II, a heavy weight lubricant, is suitable for use in high compression
reciprocating air compressors at ambient temperatures ranging from -3.9° C to 60° C (25° F to
140° F).
6.2 Acquisition requirements. Acquisition documents must specify the following:
a. Title, number, and date of this specification.
b. Part identification number.
c. Grade of lubricating oil (see 1.2).
d. Quantity required.
e. Issue of DoDISS to be cited in the solicitation, and if required, the specific issue of
individual documents referenced (see 2.3).
f. Packaging requirements (see 5.1).
6.3 Part identification number (PIN). The following part identification number procedure is for
government purposes and does not constitute a requirement for the contractor.
M
26087
-X-
X ----- Size A:
3.8 liter can (1 gallon)
Specification number Grade I
B: 18.9 liter can (5 gallon)
Grade II
C: 208.2 liter drum (55 gallon)
Prefix to indicate military specification
6.4 Subject term (key word) listing.
Copper-strip corrosion
Flash point
Foaming characteristics
Heavy weight oil
Medium weight oil
Viscosity
6.5 Changes from previous issue. Marginal notations are not used in this revision to identify
changes with respect to the previous issue due to the extent of the changes.
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