MIL-DTL-25681E
This specification is approved for use by all Departments and Agencies of the Department of Defense.
1. SCOPE
1.1 Scope. This specification covers one grade of lubricant for use on sliding surfaces subject to
high temperatures in aircraft gas turbine engines. This lubricant is identified by NATO Code Number S-
1735 (see 6.3).
2. APPLICABLE DOCUMENTS
2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this
specification. This section does not include documents cited in other sections of this specification or
recommended for additional information or as examples. While every effort has been made to ensure the
completeness of this list, document users are cautioned that they must meet all specified requirements of
documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed.
2.2 Non-government publications. The following documents form a part of this document to the
extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the
solicitation or contract.
ASTM International
ASTM D92
Flash and Fire Points by Cleveland Open Cup Tester (DoD Adopted)
ASTM D445
Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation
of Dynamic Viscosity) (DoD Adopted)
ASTM D1500
ASTM Color of Petroleum Products (ASTM Color Scale) (DoD Adopted)
ASTM D4057
Manual Sampling of Petroleum and Petroleum Products (DoD Adopted)
(Copies of these documents are available online at https://www.astm.org or the ASTM International, 100
Barr Harbor Drive, West Conshohocken PA 19428-2959)
Society of Automotive Engineers
AMS-M-7866
Molybdenum Disulfide, Technical Lubrication Grade (DoD Adopted)
(Copies of these documents are available online at https://www.sae.org or SAE International, 400
Commonwealth Drive, Warrendale PA 15096-0001 USA)
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 Toxicity. The materials shall have no adverse effect on the health of personnel when used
for their intended purpose.
3.2 Materials. The lubricant shall be of the composition listed in Table I.
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