1.1 本试验方法包括测定油形成可堵塞滤油器的沉淀物的趋势。它模拟了新发动机在短时间内运行时可能遇到的问题，然后在机油中加入一些水进行长时间存储。 1.2 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。 1.3 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（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 内燃机的一些燃烧产物渗入发动机润滑剂并保留在其中是正常的。 5.2 当发动机运行一段时间，然后长时间储存时，燃烧副产物可能以液化状态保留在机油中。 5.3 在这些情况下，可能会形成沉淀物，在下次发动机运转时损害机油的可过滤性。 5.4 本试验方法对试验油和新油进行相同的处理，以确定可过滤性的损失。 5.5 通过本试验方法获得的数据已知的参考油是可用的。 5.6 本试验方法要求也测试参考油并报告结果。有两种油可用，一种已知提供本试验方法的低数据值，另一种已知提供高数据值。 注1: 当提供新的机油测试结果作为规范（如规范）的候选机油测试结果时 D4485 该规范将说明与新油相比，试验油的最大允许过滤性损失（流量减少）。

1.1 This test method covers the determination of the tendency of an oil to form a precipitate that can plug an oil filter. It simulates a problem that may be encountered in a new engine run for a short period of time, followed by a long period of storage with some water in the oil. 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 It is normal for some of the combustion products of an internal combustion engine to penetrate into the engine lubricant and be retained in it. 5.2 When an engine is run for a period of time and then stored over a long period of time, the by-products of combustion might be retained in the oil in a liquefied state. 5.3 Under these circumstances, precipitates can form that impair the filterability of the oil the next time the engine is run. 5.4 This test method subjects the test oil and the new oil to the same treatments such that the loss of filterability can be determined. 5.5 Reference oils, on which the data obtained by this test method is known, are available. 5.6 This test method requires that a reference oil also be tested and results reported. Two oils are available, one known to give a low and one known to give a high data value for this test method. Note 1: When the new oil test results are to be offered as candidate oil test results for a specification, such as Specification D4485 , the specification will state maximum allowable loss of filterability (flow reduction) of the test oil as compared to the new oil.