... Oil can reach Grade-6(NAS1638) after purification Usage of ZL-20 oil recycling: Filtrating lubricating oil, including hydraulic oil, ... heat condition oil, gear oil and so on.Description of ZL-20 oil recycling: Reliably remove deleterious substances moisture, mechanical ... (vestage) (GB/T260)Impurity% No (GB/T511)Advantages of ZL-20 oil recycling:Divide into automatic and manual control.Automatic ...