本标准涵盖的齿轮润滑剂超过美国石油学会（API）服务分类API GL-5，适用于在高速/冲击载荷和低速/高扭矩条件下运行的准双曲面型汽车齿轮装置。这些润滑剂可能适用于其他齿轮应用，其中轴的相对位置和齿轮侧面接触类型涉及很大比例的滑动接触。此类应用通常需要极压（EP）添加剂，以防止材料从加载的齿轮齿侧粘附和随后撕裂。 这些润滑剂不适用于蜗轮的润滑。附录a是本标准的强制性部分。附录Ais中包含的信息旨在证明符合本标准的要求，并将其列入由润滑油审查机构（LRI）管理的合格产品清单（QPL）。附录a包含关键资格要求的摘要。资格要求和程序的完整列表可在项目文件（PD4000）齿轮润滑油审查计划中找到，可在性能审查协会（PRI）网站www。 p-r-i.org。

The gear lubricants covered by this standard exceed American Petroleum Institute (API) Service Classification API GL-5 and are intended for hypoid-type, automotive gear units, operating under conditions of high-speed/shock load and low-speed/high-torque. These lubricants may be appropriate for other gear applications where the position of the shafts relative to each other and the type of gear flank contact involve a large percentage of sliding contact. Such applications typically require extreme pressure (EP) additives to prevent the adhesion and subsequent tearing away of material from the loaded gear flanks. These lubricants are not appropriate for the lubrication of worm gears.Appendix Ais a mandatory part of this standard. The information contained inAppendix Ais intended for the demonstration of compliance with the requirements of this standard and for listing on the Qualified Products List (QPL) administered by the Lubricant Review Institute (LRI).Appendix Acontains a summary of key qualification requirements. A complete listing of qualification requirements and procedures can be found in the Program Document (PD4000), Gear Lubricant Review Program, available on the Performance Review Institute (PRI) website,www.p-r-i.org.