What is the function of engine oil in a car?
3 Answers
Functions of automotive engine oil: 1. As a lubricant: It reduces friction and wear between moving parts, such as between cylinder liners and piston rings, or camshafts. 2. As a coolant: It absorbs heat generated in the combustion chamber and piston crowns, cooling the engine and preventing overheating. 3. As a sealant: It fills the gaps between piston rings and cylinder liners to prevent pressure leakage. 4. As a cleaner: It prevents contaminants and oxide impurities from combustion from adhering to the engine internals, maintaining cleanliness. 5. As a rust inhibitor: It neutralizes acidic substances produced by combustion gases, preventing rust and corrosion in the engine.
As an ordinary driver who frequently drives, I believe engine oil plays an absolutely vital role in a car, just like lubricating grease protects machinery. It lubricates all the moving parts inside the engine, such as pistons and bearings, reducing wear caused by friction and ensuring smooth and quiet engine operation. At the same time, engine oil also serves as a coolant. When the engine is running, temperatures can soar to several hundred degrees, and the oil acts like a radiator, carrying away heat to prevent damage from overheating. Its cleaning function is equally crucial—engine oil traps metal shavings and carbon deposits, preventing them from accumulating and clogging up the engine, keeping the internals clean. If you don’t change the oil on time, the engine could seize or develop issues, and repair costs can be hefty. I change my oil every few thousand kilometers to ensure my car runs reliably and safely for a long time. This habit has helped me avoid a lot of trouble, especially during long-distance drives, giving me extra peace of mind.
During vehicle maintenance, I discovered that the core function of engine oil is to maintain a clean internal environment and protect the system. It effectively dissolves and removes dirt particles, preventing carbon deposits from adhering to components, which could lead to performance degradation. The oil also forms a protective film that shields against moisture and corrosive substances, preventing metal rust and corrosion, thereby extending the engine's lifespan. Another crucial function is sealing, creating an effective seal between piston rings and cylinders to ensure proper compression and efficient combustion. I regularly check the oil level and monitor the degree of color darkening. Once it turns black or becomes too thin, it's time for a change. Ignoring these signals can easily lead to leaks or engine failure. Developing this small habit can make the car more reliable and save unnecessary expenses.
