Why does an engine need engine oil?
3 Answers
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.
Having driven for decades, I deeply understand the importance of engine oil. Inside the engine, metal components operate at high speeds. Without oil, they would directly rub against each other, causing severe wear and high temperatures that can burn out parts. Engine oil forms a protective film on metal surfaces to reduce friction, dissipate heat, and cool the engine. It also cleans the interior by carrying away impurities, preventing oil passage blockages. Without oil, the engine would quickly fail—I've seen too many cases where people waste huge sums on repairs. Regularly changing the oil can extend the engine's lifespan by over ten years, ensuring smooth and safe driving. Make it a habit to check and replace the oil every 5,000 kilometers—it saves money and gives peace of mind.
As a car enthusiast, I enjoy studying the role of engine oil. It not only lubricates engine components to reduce friction loss and enhance power but also aids in heat dissipation, preventing high-temperature damage to parts since engine temperatures can get very high during operation—engine oil circulates to carry away heat. In terms of cleaning, engine oil flushes away carbon deposits and metal debris, keeping the system clean. Using synthetic oil offers superior performance, reducing wear and minimizing noise. Remember, insufficient oil accelerates wear, and regular oil changes help maintain optimal vehicle condition. I share this with fellow car enthusiasts to avoid common misconceptions.
