What is the function of engine oil?
2 Answers
Engine oil functions: 1. Lubrication and friction reduction: Forms an oil film between two sliding components to prevent friction during operation, ensuring smooth movement; 2. Cleaning and dispersion: High-quality oil can flush away surface contaminants on parts through oil flow, adsorb tiny metal debris in the engine, and then scrape it into the oil pan via the piston oil ring; 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 seal between the piston rings and pistons via an oil film to prevent combustion exhaust from entering the crankcase; 5. Rust and corrosion prevention: High-quality oil adheres to component surfaces, protecting them from contact with air, acidic substances, and harmful gases, thus safeguarding the engine from corrosion by atmosphere and water.
Engine oil plays a versatile role in the engine. From my driving experience, its most fundamental function is to lubricate internal moving parts, such as pistons, crankshafts, and bearings, reducing friction and wear, and preventing damage caused by parts rubbing against each other. The second key point is its role as a coolant—circulating to absorb engine heat, preventing overheating and potential engine failure during long summer drives, which is crucial for protecting the entire system. Engine oil also has a cleaning function, acting like a little helper that absorbs and carries away carbon deposits, metal shavings, and other impurities, keeping the engine interior clean and tidy. Otherwise, debris buildup could lead to blockages or reduced efficiency. Additionally, it provides a sealing effect, helping piston rings better seal cylinder gaps, improving compression ratio and combustion efficiency, making the car run more powerfully. Lastly, it contains additives that prevent rust and corrosion, protecting metal components from rust and extending their lifespan. Overall, regular oil changes are the simplest way to prevent major repairs—I always follow the user manual's recommendation to change it every 5,000 kilometers, keeping the engine youthful.
