highly refined oil meaning in English

深度精制滑油
深度精制油品

Test method for corrosiveness and oxidation stability of hydraulic oils , aircraft turbine engine lubricants , and other highly refined oils
液压油航空透平引擎润滑剂和其他高精炼油的腐蚀与氧化稳定性测试方法
Standard test method for corrosiveness and oxidation qualility of hydraulic oils , aircraft turbine engine lubricants , and other highly refined oils
液压油飞机涡轮发动机润滑油和其他高精炼油的腐蚀性和氧化稳定性的试验方法