1.1 本试验方法描述了一种气相色谱技术，用于测定汽油发动机中使用的旧润滑油中的汽油燃料稀释量。 1.2 本试验方法仅限于适用于宽孔径（0.53）的气相色谱仪 mm）毛细管柱，配备火焰离子化检测器（FID）和温度可编程烘箱。 1.3 通过该方法确定的燃油稀释浓度范围没有限制，但是精度声明仅适用于0.5的浓度范围 % 至20.3 % 汽油报告限制为0.5 % 该方法还包括汽油稀释。 1.4 从发动机曲轴箱中回收的润滑液由于加热、挥发、擦亮、氧化和其他反应而发生变化，因此，汽油稀释剂和发动机机油的色谱图通常与其原始模式显著不同。 因此，在比较使用新材料或在用材料进行的定量测定时，建议谨慎。 1.5 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.6 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。 1.7 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《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问题并采取适当措施。

1.1 This test method describes a gas chromatographic technique for determining the amount of gasoline fuel dilution in used lubricating oils arising from their use in gasoline engines. 1.2 This test method is limited to gas chromatographs accommodating wide-bore (0.53 mm) capillary columns and that are equipped with flame ionization detectors (FIDs) and temperature programmable ovens. 1.3 There is no limitation regarding the fuel dilution concentration range that can be determined by this method, however the precision statements apply only to the concentration range of 0.5 % to 20.3 % gasoline. A reporting limit of 0.5 % gasoline fuel dilution has also been included in the method. 1.4 Lubricating fluids recovered from engine crankcases have undergone changes due to heating, volatilization, sheering, oxidation and other reactions, and, as a result, the chromatographic profiles of the gasoline diluents and engine oils often differ significantly from their original patterns. Caution is accordingly advised when comparing quantitative determinations made using new verses used or in-service materials. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 requirements 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 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 problems and to take appropriate action.