Why does an engine need engine oil?

[EmilyMarie]

Introduction to the reasons why an engine needs engine oil: Since the components of an engine are made of metal, without lubrication, metal-to-metal friction can easily cause damage to the parts, and this damage is irreversible and cannot be restored. Therefore, it is essential to rely on engine oil to form a protective oil film on the components, which lubricates and protects the parts, reduces friction between the moving components of the engine, ensures smooth operation of the engine, and improves mechanical efficiency. Engine oil has six main functions: lubrication and friction reduction, cleaning and dispersion, cooling, sealing and leakage prevention, corrosion and rust prevention, and shock absorption. Below are the detailed explanations: 1. Lubrication and friction reduction: Forms an oil film between two sliding surfaces to prevent friction and ensure smooth operation. 2. Cleaning and dispersion: High-quality engine oil flows to wash away dirt from component surfaces, absorbs tiny metal particles, and then carries them to the oil pan via the piston rings. 3. Cooling: The engine generates high temperatures during operation. When oil reaches these areas, it absorbs heat and carries it away, aiding in component cooling. 4. Sealing and leakage prevention: Forms a sealing ring between the piston rings and piston via the oil film, preventing combustion gases from entering the crankcase. 5. Corrosion and rust prevention: High-quality oil adheres to component surfaces, protecting them from air, acidic substances, and harmful gases, thereby preventing corrosion from moisture and air and safeguarding the engine. 6. Shock absorption: When cylinder pressure increases suddenly, the load on the piston, piston rings, connecting rod, and crankshaft bearings becomes substantial. The lubrication provided by the oil helps absorb and buffer these impact loads.