ASTM D7603-23

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7603 − 23
Standard Test Method for
Determination of Storage Stability and Compatibility in
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Automotive Gear Oils
This standard is issued under the fixed designation D7603; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E1272 Specification for Laboratory Glass Graduated Cylin-
ders
1.1 This test method covers the determination of storage
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2.2 SAE Standards:
stability characteristics and the compatibility of automotive
J2360 Lubricating Oil, Gear Multipurpose (Metric) Military
gear lubricants when blended with reference lubricants. The
Use
purpose of the test is to determine if performance-enhancing
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additives separate out under defined conditions.
2.3 Federal Test Method Standard:
FED-STD-791/3440.1 Storage Solubility Characteristics of
1.2 The values stated in SI units are to be regarded as
Universal Gear Lubricants
standard. No other units of measurement are included in this
FED-STD-791/3440.2 Compatibility Characteristics of Uni-
standard.
versal Gear Lubricants
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3. Terminology
responsibility of the user of this standard to establish appro-
3.1 Definitions:
priate safety, health, and environmental practices and deter-
3.1.1 calibrate, v—to determine the indication or output of a
mine the applicability of regulatory limitations prior to use.
measuring device (for example, thermometer, manometer,
1.4 This international standard was developed in accor-
engine) with respect to that of a standard.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
3.1.2 candidate oil, n—an oil that is intended to have the
Development of International Standards, Guides and Recom-
performance characteristics necessary to satisfy a specification
mendations issued by the World Trade Organization Technical
and is to be tested against that specification. D4175
Barriers to Trade (TBT) Committee.
3.1.3 reference oil, n—an oil of known performance
characteristics, used as a basis for comparison.
2. Referenced Documents
3.1.3.1 Discussion—Reference oils are used to calibrate
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2.1 ASTM Standards:
testing facilities, to compare the performance of other oils, or
D235 Specification for Mineral Spirits (Petroleum Spirits)
to evaluate other materials (such as seals) that interact with
(Hydrocarbon Dry Cleaning Solvent)
oils. D4175
D1193 Specification for Reagent Water
3.1.4 test oil, n—any oil subjected to evaluation in an
D4175 Terminology Relating to Petroleum Products, Liquid
established procedure. D4175
Fuels, and Lubricants
D5760 Specification for Performance of Manual Transmis-
4. Summary of Test Method
sion Gear Lubricants
4.1 Separation of the performance-enhancing additives in a
E542 Practice for Gravimetric Calibration of Laboratory
test oil during storage is determined by heating it to 120 °C,
Volumetric Instruments
storing at room temperature for 30 days, and making a
qualitative observation as to whether any material has sepa-
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This test method is under the jurisdiction of ASTM Committee D02 on rated out.
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
Subcommittee D02.B0.01 on Passenger Car Engine Oils.
Current edition approved March 1, 2023. Published April 2023. Originally
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approved in 2010. Last previous edition approved in 2013 as D7603 – 13, which was Available from SAE International (SAE), 400 Commonwealth Dr., Warrendale,
withdrawn January 2022 and reinstated in March 2023. DOI:10.1520/D7603-23. PA 15096-0001, http://www.sae.org.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available online at www.assistdocs.com (search for FED-STD-791 in the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM document ID field or from Standardization Documents Order Desk, DODSSP, Bldg.
Standards volume information, refer to the standard’s Document Summary page on 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
the ASTM website. dodssp.daps.dla.mil.
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D7603 − 23
4.1.1 An optional, non-mandatory test method is also de- between various calibration marks are given in Table 1 and
scribed in Append
...