- The function of reducing friction: forming an oil film on the metal surface, turning solid friction into liquid friction to reduce friction,
- Cooling function: Friction heat will be generated in the areas where friction occurs, especially between metals, to a more severe extent. Lubricating oil absorbs this heat or releases it to the outside.
- Shock absorption function: For contact operations of gears, bearings, and other parts, if the contact surface is limited to points or lines, it will instantly bear high loads. If lubricating oil is sprayed, the lubricating oil film will play a role in dispersing the load into the oil film, protecting the system from high load damage.
- Cleaning function: Lubricating oil plays a role in cleaning these foreign objects through its own properties like soap.
- Sealing function: In the oil pressure device, the formation of the oil pressure film of the lubricating oil itself can prevent oil leakage.
- Rust prevention function: Lubricating oil forms a protective film on the metal surface, blocking the corrosion of air and moisture on the metal, thereby achieving the purpose of rust prevention.
