1.1 本规范涵盖了在汽车、卡车、厢式货车、公共汽车和非公路农场、工业和建筑设备的各种工况下使用的轻型和重型内燃机的机油。 2. 1.2 本规范不适用于发动机机油应用，如舷外发动机、雪地摩托、割草机、摩托车、铁路机车或远洋船舶。 1.3 本规范基于发动机测试结果，这些结果通常与使用汽油或柴油运行的实际服务发动机中的参考油的结果相关。由于它属于API SL发动机油类别，因此它基于发动机测试结果，该结果通常与2000年之前定义发动机油类别的汽油发动机顺序测试中的参考机油的结果相关。应认识到，并非所有方面的发动机油性能都通过本规范中的发动机测试进行评估。 此外，在评估机油性能时，最好在实际操作条件下评估机油。 1.4 本规范包括台架和化学测试，这些测试有助于评估本规范中发动机测试未涵盖的发动机机油性能的某些方面。 1.5 以国际单位制表示的值应视为标准值。本标准不包括其他测量单位。 1.5.1 例外情况: 1.5.1.1 滚子从动轴磨损试验方法 D5966型 单位为密耳。 1.5.1.2 试验方法中的耗油量 D6750型 单位为克/千瓦时。 注1: kWh单位已弃用。优选的国际单位制单位为焦耳（J）；1千瓦时=3.6兆焦耳。 1.5.1.3 试验方法中的轴承磨损 第6709页 单位为克，描述为重量损失，非SI术语。 1.5.1.4 一些附录是从其他来源逐字而来的，包括非国际单位制单位。 1. 6. 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。

1.1 This specification covers engine oils for light-duty and heavy-duty internal combustion engines used under a variety of operating conditions in automobiles, trucks, vans, buses, and off-highway farm, industrial, and construction equipment. 2 1.2 This specification is not intended to cover engine oil applications such as outboard motors, snowmobiles, lawn mowers, motorcycles, railroad locomotives, or oceangoing vessels. 1.3 This specification is based on engine test results that generally have been correlated with results obtained on reference oils in actual service engines operating with gasoline or diesel fuel. As it pertains to the API SL engine oil category, it is based on engine test results that generally have been correlated with results obtained on reference oils run in gasoline engine Sequence Tests that defined engine oil categories prior to 2000. It should be recognized that not all aspects of engine oil performance are evaluated by the engine tests in this specification. In addition, when assessing oil performance, it is desirable that the oil be evaluated under actual operating conditions. 1.4 This specification includes bench and chemical tests that help evaluate some aspects of engine oil performance not covered by the engine tests in this specification. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5.1 Exceptions: 1.5.1.1 The roller follower shaft wear in Test Method D5966 is in mils. 1.5.1.2 The oil consumption in Test Method D6750 is in grams per kilowatthour. Note 1: The kWh unit is deprecated. The preferred SI unit is the joule (J); 1 kWh = 3.6 MJ. 1.5.1.3 The bearing wear in Test Method D6709 is in grams and is described as weight loss, a non-SI term. 1.5.1.4 Some of the appendixes are verbatim from other sources, and non-SI units are included. 1.6 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.