What is the purpose of engine oil in a car?

[LeLucia]

Engine oil serves several functions: 1. As a lubricant: It reduces friction and wear between moving parts, such as between the cylinder liner and piston rings, or the camshaft. 2. As a coolant: It absorbs heat generated in the engine combustion chamber and piston crown, 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 pollutants and oxide impurities produced during combustion from adhering to the engine interior, maintaining cleanliness. 5. As an anti-rust agent: It neutralizes acidic substances generated by combustion gases, protecting the engine from rust and corrosion. Engine oil, also known as engine lubricant, is often referred to as the lifeblood of a car. It consists of base oil and additives. The base oil is the main component of the lubricant, determining its basic properties, while additives compensate for and improve the shortcomings of the base oil, providing certain new characteristics, making them an essential part of the lubricant.

[DelWyatt]

I think motor oil plays an extremely important role in cars. It acts like a protective layer for the engine, lubricating friction between all metal components to reduce wear and ensure smoother engine operation. In my daily driving, the oil also helps with cleaning by carrying away dust and carbon deposits, preventing dirt buildup that could degrade performance. Its cooling function is equally crucial – the oil absorbs heat and transfers it to the cooling system, preventing engine overheating and seizure. For sealing, the oil forms a barrier between piston rings and cylinders to prevent gas leaks and improve efficiency. Rust protection is indispensable too, keeping metal parts corrosion-free for extended lifespan. The damping effect reduces vibrations and noise for a quieter ride. If oil changes are neglected, the engine may develop abnormal noises or even fail completely. I recommend checking it every 5,000 kilometers. Regular oil maintenance improves fuel efficiency and reliability while avoiding repair headaches.

[SanAaliyah]

Engine oil plays multiple roles in a car engine, with lubrication of moving parts like the crankshaft and bearings being the primary function, reducing friction for smoother operation. Cleaning is also crucial, as the oil suspends impurities and carries them to the filter for removal. In terms of cooling, it absorbs heat when the engine runs hot to prevent damage. Acting as a sealant, it fills the gaps between piston rings to enhance compression ratio and reduce exhaust emissions. Its anti-rust properties protect metal surfaces from corrosion. The cushioning effect absorbs shocks, ensuring smooth and quiet operation. I've noticed that oil selection impacts performance—thicker viscosity for summer in high temperatures and thinner for winter in cold conditions. Checking the dipstick is straightforward; I regularly monitor the oil's color and level, replacing it as needed to prevent minor issues from escalating into major repairs, ensuring long-lasting durability and safe driving.

[QuinnMarie]

Engine oil reduces friction between engine components for smooth rotation, cleans and removes internal dirt to prevent carbon buildup. It cools the engine to prevent overheating, especially during long summer drives. It seals pistons to ensure efficiency and prevent gas leakage. It prevents rust, extending component lifespan. It buffers vibrations for stable and quiet operation. I always check the dipstick to ensure proper oil levels and change it regularly to ensure safety and reduce the risk of malfunctions.