1.1 本试验方法包括通过气相色谱法测定在用发动机油的燃料稀释度。 1.2 可通过该试验方法直接进行分析，无需对样品进行预处理或稀释。 1.3 如果样品量在气相色谱检测器的线性范围内，则对稀释范围的确定没有限制。然而，样品稀释可能会给结果增加潜在误差，并可能影响与第节中所示值相比获得的精度 14 ，其在不稀释的情况下获得。 1.4 该测试方法的定量范围可达10 % （m/m）适用于柴油和生物柴油，最高可达5 % （m/m）用于汽油。 1.5 以国际单位制表示的值应视为标准值。如果提供非国际单位制单位，则在括号中显示。 1.6 本标准并不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建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 在典型操作条件下，在用发动机机油的某些燃油稀释是正常的。然而，过度稀释燃油会导致性能下降、过早磨损或发动机突然故障。 该试验方法提供了一种量化燃料稀释水平的方法，允许用户采取必要的措施。由于与曲轴箱中燃料老化和退化相关的限制，本试验方法不能准确量化在用润滑剂样品中存在的特定燃料。相反，使用模拟老化燃料对柴油进行量化。

1.1 This test method covers the determination of fuel dilution for in-service engine oil by gas chromatography. 1.2 Analysis can be performed directly by this test method without pretreatment or dilution of the sample. 1.3 There is no limitation for the determination of the dilution range, provided the amount of sample is within the linear range of the gas chromatograph detector. However, sample dilution can add potential error to the result and may affect the precision obtained as compared to the values presented in Section 14 , which were obtained with no dilution. 1.4 This test method covers a quantitation range up to 10 % (m/m) for diesel and biodiesel, and up to 5 % (m/m) for gasoline. 1.5 The values stated in SI units are to be regarded as standard. Where non-SI units are provided, they are shown in parentheses. 1.6 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. 1.7 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 in-service engine oil is normal under typical operating conditions. However, excessive fuel dilution can lead to decreased performance, premature wear, or sudden engine failure. This test method provides a means of quantifying the level of fuel dilution, allowing the user to take necessary action. This test method does not purport to accurately quantify the specific fuel present in the in-service lubricant samples due to limitations associated with the aging and degradation of the fuel in the crankcase. Rather, quantification of diesel fuel is normalized using a simulated aged fuel.