Lubricating oil is a liquid or semi-solid lubricant used in various types of automobiles and machinery to reduce friction and protect machinery and processed parts. It mainly functions as lubrication, auxiliary cooling, rust prevention, cleaning, sealing and buffering (Roab). .
Lubricating oil is a technology-intensive product that is a mixture of complex hydrocarbons whose true performance is a combination of complex physical or chemical processes. The basic properties of lubricating oil include general physical and chemical properties, special physical and chemical properties and simulated bench test.