Abstract: Fuels and lubricating oils used by automobiles are classified as gasoline, diesel oil, gear oil and lubricating grease, etc. In this paper, the characteristics of various motor oils and the oils' applicability are introduced. It is emphatically pointed out that strengthening the quality control of motor oils in the process of loading/unloading and filling is an important daily work to be done for tank farm or filling station. Measures in quality control of motor oils are put forward.