本SAE推荐实施规程描述了一种经验方法，通过基于金属元素浓度计算775℃下形成的金属氧化物的当量来确定航空活塞发动机润滑油的理论灰分含量。灰分测定的计算方法可作为ASTM D 482的替代方法，用于航空活塞发动机润滑油的标准。

This SAE Recommended Practice describes an empirical method for determining the theoretical ash content of aviation piston engine lubricating oils by calculating the equivalent weight of metallic oxides formed at 775 ¿¿C based on the metallic elemental concentration.The calculation method of ash determination may be used as an alternate to ASTM D 482 for application to the standards for aviation piston engine lubricating oils.