... kinds of llubricating oils, e.g.: gear oil, hydraulic oil freezer oil, compressor oil, vacuum pump oil, internal-combustion oil, heat treatment oil ... of lubrication oil, such as gear oil, engine oil, hydraulic oil, freezer oil, compressor oil, vacuum pump oil, internal-combustion oil, heat treatment oil ... and large area multiple-level separation technology of oil, water and gas to remove water content ...