1.1本试验方法通常称为康明斯M11高烟尘试验（HST）。该测试方法定义了在高烟尘条件下进行的重型柴油发动机测试程序，以评估与阀系磨损、污泥沉积和机油滤清器堵塞有关的机油性能。 1.2以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 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和健康实践，并确定监管限制的适用性。 一般安全预防措施见附录A1。 ====意义和用途====== 本试验方法旨在评估发动机机油在高负荷工况下控制发动机磨损和沉积物的性能，所选工况用于加速涡轮增压后冷四冲程柴油发动机中的烟尘生成、气门系磨损和沉积物形成。 当本试验方法的所有细节均符合要求时，本试验方法可用于发动机机油规格验收。规范中包含了适用的发动机机油服务类别 D4485 . 测试方法与现场服务数据相关，从侧面确定- 公路服务中两种或两种以上机油的横向比较。这些数据包含在一份研究报告中。这些相同的现场使用油用于制定本试验方法的操作条件。 本试验方法中使用的发动机设计代表了许多但并非所有现代柴油发动机。外推试验结果时，应考虑该因素以及加速运行条件。

1.1 This test method is commonly referred to as the Cummins M11 High Soot Test (HST). The test method defines a heavy-duty diesel engine test procedure conducted under high soot conditions to evaluate oil performance with regard to valve train wear, sludge deposits, and oil filter plugging. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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 and health practices and determine the applicability of regulatory limitations prior to use. See Annex A1 for general safety precautions. ====== Significance And Use ====== This test method was developed to assess the performance of an engine oil to control engine wear and deposits under heavy duty operating conditions selected to accelerate soot production, valve train wear, and deposit formation in a turbocharged, aftercooled four-stroke-cycle diesel engine. This test method may be used for engine oil specification acceptance when all details of this test method are in compliance. Applicable engine oil service categories are included in Specification D4485 . The test method was correlated with field service data, determined from side-by-side comparisons of two or more oils in on-highway service. These data are contained in a research report. These same field service oils were used to develop the operating conditions of this test method. The design of the engine used in this test method is representative of many, but not all, modern diesel engines. This factor, along with the accelerated operating conditions should be considered when extrapolating test results.