1.1 本试验方法包括用纸过滤法测定废旧润滑油中凝结的戊烷不溶物。 1.2 该测试方法最初是由机车维修人员协会（LMOA）的燃料、润滑油和环境委员会（FL&E）开发的。 2 1.3 该测试方法主要用于测试铁路机车服务中使用过的柴油机油。它可以应用于其他样品类型，但尚未确定除使用过的铁路机车柴油机油以外的样品的精度、偏差和显著性。 1.4 该试验方法通常与试验方法无关 D893 在润滑油中的不溶物上，因为它使用离心分离和更浓缩的抗凝剂溶液。 1.5 本试验方法与试验方法中附录A4（增强型热重分析（TGA）方法）的相关性 D5967 尚未被调查。 1.6 以SI单位表示的值将被视为标准值。本标准不包括其他计量单位。 1.7 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。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法规限制的适用性。 具体警告语句，请参见 7.2 , 7.3 ，和 7.4 . 1.8 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》中确立的国际公认的标准化原则制定的。======意义和用途====== 5.1 凝结的戊烷不溶物可包括油不溶性物质、源自油或添加剂降解的一些油不溶性树脂物质、来自不完全柴油燃料燃烧的烟灰或所有三者的组合。 5.2 凝结戊烷不溶物的显著变化表明油的变化，这可能导致润滑系统问题。 5.3 凝结戊烷不溶物测量还可以帮助评估废油的性能特征或确定设备故障的原因。 5.4 高值的凝结戊烷不溶物与堵塞的机油滤清器有关，导致旁通阀打开和发动机中未过滤的机油循环。这可能导致活塞沉积物增加、轴承磨损增加和发动机过早故障。

1.1 This test method covers the determination of coagulated pentane insolubles in used lubricating oils by a paper filtration method. 1.2 This test method was originally developed by the Fuels, Lubricants, and Environmental Committee (FL&E) of the Locomotive Maintenance Officer’s Association (LMOA). 2 1.3 This test method is used primary for testing used diesel engine oils from railroad locomotive service. It may be applied to other samples types but precision, bias, and significance have not been determined for samples other than used railroad locomotive diesel engine oils. 1.4 This test method, in general, does not correlate with Test Method D893 on Insolubles in Lubricating Oils, since it uses separation by centrifugation and a more concentrated solution of anti-coagulant. 1.5 The correlation between this test method and Appendix A4 (Enhanced Thermal Gravimetric Analysis (TGA) Procedure) in Test Method D5967 has not been investigated. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 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. For specific warning statements, see 7.2 , 7.3 , and 7.4 . 1.8 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 Coagulated pentane insolubles can include oil-insoluble materials, some oil-insoluble resinous matter originating from oil or additive degradation, soot from incomplete diesel fuel combustion, or a combination of all three. 5.2 A significant change in coagulated pentane insolubles indicates a change in oil, and this could lead to lubrication system problems. 5.3 Coagulated pentane insolubles measurements can also assist in evaluating the performance characteristics of a used oil or in determining the cause of equipment failure. 5.4 High values of coagulated pentane insolubles have been associated with plugged oil filters, leading to opening of the bypass valve and circulation of unfiltered oil in the engine. This can lead to increased piston deposits, increased bearing wear, and premature engine failure.