“废机油”常见的英文表达是 “waste engine oil” 。
“waste”意为“废弃的、无用的”；“engine”指“发动机”；“oil”是“油” ，整体组合准确地表达了“废机油”这一概念。
例如：Waste engine oil contains a lot of harmful substances and needs to be disposed of properly.（废机油含有大量有害物质，需要妥善处理。）