Lubricating oil and grease, in general, are one type of lubricant. The so-called lubricant, in simple terms, is a device that is located between two objects in relative motion and has the function of reducing friction between two objects due to contact.

Lubricating oil is a technology intensive product that is a complex mixture of hydrocarbons, and its true performance is the comprehensive effect of complex physical or chemical changes. The basic properties of lubricating oil include general physicochemical properties, special physicochemical properties, and simulated bench tests.

Each type of lubricating grease has its common general physicochemical properties to indicate the inherent quality of the product.

(1) Lubricating oil: an oil used as a lubricant (such as distilled petroleum or fatty acids)

(2) Lubricant: an oily liquid applied to the surface of moving parts such as machine bearings or a certain part of the human body. It has functions such as reducing friction, avoiding heat, preventing machine wear, and medical use. Generally, it is a product of fractional distillation of petroleum, and there are also extracts from vegetable oil. Contains "lubricating grease". Generally, it is a non volatile oily lubricant.