废润滑油 meaning in English

spent lubrication oil

The recycling of used lubricating oil at home and abroad
国内外废润滑油的再生
Technical guides for collection and re - refining of used oil
废润滑油回收与再生利用技术导则
Specification for industrial burner fuels from used lubricating oils
来自废润滑油的工业锅炉燃料规范
Standard specification for commercial boiler fuels with used lubricating oils
掺有废润滑油的商用锅炉燃料标准规范
Test method for semi - quantitative micro determination of acid number of used lubricating oils
废润滑油酸值半定量法微观测定方法