MIL-PRF-17331K(SH)
ASTM D4927
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Standard Test Method for Elemental Analysis of Lubricant and Additive
Components-Barium, Calcium, Phosphorus, Sulfur, and Zinc by Wavelength-
Dispersive X-Ray Fluorescence Spectroscopy
ASTM D4951
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Standard Test Method for Determination of Additive Elements in Lubricating Oils by
Inductively Coupled Plasma Atomic Emission Spectrometry
ASTM D5182
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Standard Test Method for Evaluating the Scuffing Load Capacity of Oils (FZG Visual
Method)
ASTM D5950
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Standard Test Method for Pour Point of Petroleum Products (Automatic Tilt Method)
ASTM D6304
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Standard Test Method for Determination of Water in Petroleum Products, Lubricating
Oils, and Additives by Coulometric Karl Fischer Titration
ASTM D6443
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Standard Test Method for Determination of Calcium, Chlorine, Copper, Magnesium,
Phosphorus, Sulfur, and Zinc in Unused Lubricating Oils and Additives by
Wavelength Dispersive X-ray Fluorescence Spectrometry (Mathematical Correction
Procedure)
ASTM D6481
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Standard Test Method for Determination of Phosphorus, Sulfur, Calcium, and Zinc in
Lubrication Oils by Energy Dispersive X-ray Fluorescence Spectroscopy
ASTM E29
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Standard Practice for Using Significant Digits in Test Data to Determine
Conformance with Specifications
(Copies of these documents are available from ASTM International, 100 Barr Harbor Dr., P.O. Box C700, West
Conshohocken, PA 19428-2959 or online at www.astm.org.)
2.4 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 General. For purposes of determining conformance with each requirement, an observed value or calculated
value shall be rounded off to the nearest unit in the last right-hand place of figures used in expressing the limiting
value, in accordance with the rounding-off procedure given in ASTM E29.
3.2 Qualification. The lubricating oil furnished under this specification shall be products that are authorized by
the qualifying activity for listing on the applicable Qualified Products List (QPL) before contract award (see 4.2 and
3.3 Material. The lubricating oil shall be a stable, homogeneous blend of virgin petroleum lubricating oil
stocks plus additive agents, if necessary, to meet the requirements of this specification. However, the use of
additives to improve the viscosity-temperature characteristics of the base stocks is not permitted, although additives,
in quantities up to 0.5 percent by weight, may be used to meet the pour point requirement. Additives, if used, shall
not contain chlorine or zinc materials. Additive components as contained in the sample tested and granted
qualification approval shall not be changed without approval of the qualifying activity.
3.4 Oil compatibility. The lubricating oil shall be compatible with reference oil furnished by the Government
3.5 Homogeneity. Additive agents, when used, shall remain uniformly distributed throughout the oil at all
temperatures above the pour point and up to 121 °C (250 °F). If the oil is cooled below its pour point, it shall regain
its homogeneity at temperatures of 6 °C (10 °F) above its pour point and shall retain that homogeneity up to 121 °C
(250 °F) (see 4.4.1).
3.6 Chemical and physical. The lubricating oil shall conform to the chemical and physical requirements as
specified in table I.
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