1.1 本试验方法涵盖了汽车齿轮润滑剂与参考润滑剂混合时储存稳定性特性和兼容性的测定。试验的目的是确定性能增强添加剂是否在规定的条件下分离。 1.2 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 为了避免设备故障，齿轮油应保持为均匀的液体，并且当油长时间储存时，性能增强添加剂不应分离。 5.2 此外，由于加满时经常混合不同的油，因此不同制造商的齿轮油或含有不同的基础油或性能- 增强添加剂应该是完全可混溶的并且彼此相容。如果发生凝胶化或添加剂脱落，这种混合物的任何不相容性也可能导致设备故障。 5.3 本试验方法中描述的试验程序旨在评估齿轮油在上述每种情况下的性能。 5.4 本试验方法基于FED-STD-791/344.0.1和FED-STD-792/344.0.2的单独试验方法。对FED测试方法进行了微小的更改，以提供一致的统一程序。这些变化不会显著改变测试程序。因此，该试验方法有可能作为齿轮油规范（如SAE J2360和规范）中FED试验方法的替代方法 D5760 .

1.1 This test method covers the determination of storage stability characteristics and the compatibility of automotive gear lubricants when blended with reference lubricants. The purpose of the test is to determine if performance-enhancing additives separate out under defined conditions. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 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. ====== Significance And Use ====== 5.1 To avoid equipment failure, a gear oil should remain a homogeneous liquid and the performance-enhancing additives should not separate out when the oil is stored for an extended period of time. 5.2 In addition, because different oils are often mixed when topping off, gear oils from different manufacturers, or containing different base fluids or performance-enhancing additives should be completely miscible and compatible with each other. Any incompatibility of such mixtures can also result in equipment failure if gelation or additive dropout occurs. 5.3 The test procedures described in this test method are designed to evaluate the performance of gear oils in each of the above circumstances. 5.4 This test method is based on the separate test methods FED-STD-791/3440.1 and FED-STD-791/3440.2. Minor changes have been made to the FED test methods to provide a coherent unified procedure. These changes do not significantly alter the test procedures. This test method has, therefore, potential for use as an alternative to the FED test methods in gear oil specifications such as SAE J2360 and Specification D5760 .