Lubricating oil is a liquid or semi-solid lubricant used in various types of automobiles and mechanical equipment to reduce friction and protect machinery and workpiece. It is generally composed of base oil and additives. Lubricants are a technology-intensive product, a complex mixture of hydrocarbons, mainly used for lubrication, cooling, rust prevention, cleaning, sealing and buffering.
"Black gold" Unprocessed oil is called crude oil. A dark - brown, viscous, oily liquid with a distinctive odor and green fluorescence. It is a mixture of liquid hydrocarbons such as alkanes, cycloalkanes, aromatic hydrocarbons and alkenes.