1.1 本试验方法包括使用气相色谱法测定用过的发动机润滑油中的柴油量。该测试仅限于SAE 30机油。在高达12%的浓度下分析柴油稀释剂 % 按质量计算。 注1: 本试验方法可适用于粘度等级较高的油。然而，这些油不包括在用于制定精度声明的程序中。 1.2 本试验方法仅限于配备火焰离子化检测器和温度可编程烘箱的气相色谱仪。 注2: 已报告使用了其他探测器和仪器。然而，精度声明仅适用于使用指定仪器的情况。 1.3 柴油和SAE 30发动机机油的沸腾范围有些重叠。此外，来自不同来源的SAE 30机油的沸腾范围可能会有很大差异。因此，校准可以更改多达2 %, 在燃油稀释方面。 当测试未知或混合品牌的旧发动机机油时，应意识到该方法的精度可能低于使用代表所测试旧机油的新机油进行校准时获得的精度。 1.4 以国际单位制表示的数值应视为标准。以英寸-磅为单位的数值仅供参考。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管要求的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 正常运行期间，发动机机油可能会发生一些燃油稀释。然而，就可能的性能问题而言，燃油过度稀释值得关注。该方法提供了一种确定燃油稀释程度的方法，使用户能够预测性能并采取适当措施。

1.1 This test method covers the use of gas chromatography to determine the amount of diesel fuel in used engine lubricating oil. This test is limited to SAE 30 oil. The diesel fuel diluent is analyzed at concentrations up to 12 % by mass. Note 1: This test method may be applicable to higher viscosity grade oils. However, such oils were not included in the program used to develop the precision statement. 1.2 This test method is limited to gas chromatographs equipped with flame ionization detectors and temperature programmable ovens. Note 2: The use of other detectors and instrumentation has been reported. However, the precision statement applies only when the instrumentation specified is employed. 1.3 There is some overlap of the boiling ranges of diesel fuel and SAE 30 engine oils. Moreover, the boiling range of SAE 30 oils from various sources can vary appreciably. As a result, the calibration can be altered by as much as 2 %, in terms of fuel dilution. When testing unknown or mixed brands of used engine oil, it should be realized that the precision of the method may be poorer than the precision obtained when calibrating with a new oil representative of the used oil being tested. 1.4 The values stated in SI units are to be regarded as the standard. The values stated in inch-pound units are for information only. 1.5 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 requirements prior to use. 1.6 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 Some fuel dilution of the engine oil may take place during normal operation. However, excessive fuel dilution is of concern in terms of possible performance problems. This method provides a means to determine the magnitude of the fuel dilution, providing the user with the ability to predict performance and to take appropriate action.