What are the five main functions of engine oil?
2 Answers
The following are the functions of engine oil: 1. Lubrication: There is rapid relative sliding between the piston and cylinder, as well as between the main shaft and bearing bush. To prevent excessive wear of parts, an oil film needs to be established between the two sliding surfaces. 2. Auxiliary cooling: Engine oil has a relatively low specific heat value and, being inside the engine, does not inherently have a cooling function. However, due to the heat energy generated by fuel combustion in the engine, engine oil can carry heat back to the oil tank during engine operation and then dissipate it into the air, helping the radiator cool the engine. 3. Cleaning: Engine oil can carry carbon deposits, sludge, and worn metal particles from engine parts back to the oil tank through circulation, flushing away dirt generated on the working surfaces of parts via the flow of lubricating oil. 4. Sealing and leak prevention: Engine oil can form a sealing ring between the piston ring and piston, reducing gas leakage and preventing external contaminants from entering. 5. Rust and corrosion prevention: Lubricating oil can adhere to the surfaces of parts, preventing contact with water, air, acidic substances, and harmful gases.
I've been driving for several years and deeply understand the importance of engine oil. The five major functions of engine oil include: First, lubricating engine components to reduce friction between moving parts and prevent wear, which directly extends engine life; Second, the cooling function, as circulating oil carries away heat to prevent engine overheating, especially critical during high-temperature summer driving; Third, the cleaning effect, as it removes carbon deposits and impurities generated during combustion, keeping the internals clean and avoiding clogging issues; Fourth, the sealing function, particularly forming a protective layer between pistons and cylinder walls to improve compression efficiency and save fuel; Fifth, rust and corrosion prevention, protecting metal parts from rust and chemical erosion. Regular oil changes not only prevent these failures but also improve fuel economy, saving significant fuel and repair costs. For example, the last time I neglected an oil change, it resulted in engine knocking, costing thousands in repairs. Remember these points, and your car will run smoother and safer.
