1.1 该试验方法测量发动机曲轴箱油在低工作温度条件下控制火花点火发动机气门机构磨损的能力。该试验方法旨在模拟延长发动机循环车辆运行。序列IVB测试方法使用丰田2NR-FE水冷、4循环、直列气缸、1.5 L发动机。主要结果是斗式提升机磨损。次要结果包括凸轮凸角鼻部磨损和用过的发动机油中铁（Fe）磨损金属浓度的测量。其他测定，如曲轴箱油的燃料稀释度、有色金属磨损金属浓度、总燃料消耗和总油消耗，可用于评估测试结果的有效性。 2 1.2 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。 1.2.1 例外情况- 没有直接的SI等效物，如管件、管道、NPT螺纹/直径或指定的单一来源设备。 1.3 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。如有必要，在本文件的每个特定章节中提供了具体的警告声明。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《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 开发该试验方法是为了评估汽车润滑油对控制带有直接作用斗式挺杆的顶置凸轮轴发动机的气门机构磨损和发动机整体磨损的效果。 5.2 平均进气挺杆容积损失用于衡量机油防止气门机构磨损的能力。 5.3 测试结束时的机油铁浓度用于衡量机油防止发动机整体磨损的能力。 附注2: 该测试方法可用于发动机油规格，如API SP、ILSAC GF-6A和GF-6B。

1.1 This test method measures the ability of an engine crankcase oil to control valve-train wear in spark-ignition engines at low operating temperature conditions. This test method is designed to simulate extended engine cyclic vehicle operation. The Sequence IVB Test Method uses a Toyota 2NR-FE water cooled, 4 cycle, in-line cylinder, 1.5 L engine. The primary result is bucket lifter wear. Secondary results include cam lobe nose wear and measurement of iron (Fe) wear metal concentration in the used engine oil. Other determinations such as fuel dilution of the crankcase oil, non-ferrous wear metal concentrations, total fuel consumption, and total oil consumption, can be useful in the assessment of the validity of the test results. 2 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.2.1 Exceptions— Where there is no direct SI equivalent such as pipe fittings, tubing, NPT screw threads/diameters, or single source equipment specified. 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. Specific warning statements are provided throughout this document as necessary in each particular section. 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 This test method was developed to evaluate automotive lubricant’s effect on controlling valve-train wear and overall engine wear for overhead camshaft engines with direct acting bucket lifters. 5.2 Average intake lifter volume loss is used as a measure of an oil’s ability to prevent valve-train wear. 5.3 End-of-test oil iron concentration is used as a measure of an oil’s ability to prevent overall engine wear. Note 2: This test method may be used for engine oil specifications such as API SP, and ILSAC GF- 6A, and GF-6B.