What are the functions of engine oil in a car engine?
3 Answers
The functions of engine oil in a car engine include: 1. Lubrication and friction reduction: forming an oil film between two sliding parts to prevent friction during operation; 2. Cleaning and dispersion: the flowing oil can wash away dirt on the surface of parts and absorb tiny metal fragments in the engine, which are then scraped into the oil pan by the piston oil ring; 3. Cooling: when the engine generates high temperatures during operation, the oil absorbs heat upon reaching the operating parts to assist in heat dissipation; 4. Sealing and leakage prevention: forming a seal between the piston rings and pistons through an oil film to prevent exhaust gases from entering the crankcase; 5. Rust and corrosion prevention: high-quality oil can adhere to the surface of parts, preventing contact with air, acidic substances, and harmful gases, thus protecting the engine from corrosion by atmosphere and water; 6. Shock absorption and buffering: when the pressure in the engine cylinder increases, the load on the pistons, piston rings, connecting rods, and crankshaft bearings becomes significant. This load is transmitted and lubricated through the bearings, cushioning the impact load.
I've driven many cars and deeply understand the importance of engine oil to an engine—it's as essential as giving a machine water to drink. Its primary role is lubrication, forming an oil film between moving engine parts to reduce friction-generated heat and wear, ensuring smoother and quieter operation. It also handles heat dissipation, circulating to carry away high temperatures and prevent engine burnout or power loss, especially noticeable during long-distance driving. The cleaning function shouldn't be overlooked either; it traps dust, debris, and carbon deposits, preventing oil passage blockages and component damage. In terms of sealing, engine oil fills gaps between cylinders and pistons, improving compression efficiency and saving fuel. Regular oil changes are crucial—otherwise, aging and thickening oil can increase fuel consumption. Based on my experience, checking it every 5,000 kilometers or so can significantly extend engine life, avoid major repairs, and make driving safer and more comfortable.
During vehicle maintenance, I discovered that engine oil serves multiple purposes, with its core function being to lubricate and protect the internal components of the engine. Engine oil forms a thin film on bearing and piston surfaces to reduce wear, ensuring smooth operation of parts and minimizing the risk of malfunctions. Heat dissipation is another critical aspect, as it transfers heat to assist the cooling system in preventing overheating and cylinder explosions, which is vital for maintaining performance. It also cleans the engine by flushing away metal debris and impurities, keeping the internals clean and preventing blockages. Additionally, engine oil provides sealing effects that enhance cylinder compression ratios, leading to more complete combustion and fuel savings. Choosing the right oil grade and viscosity is crucial, and it's generally recommended to follow the owner's manual for regular changes, such as every six months or 10,000 kilometers, to effectively extend the engine's lifespan. Don't overlook this simple yet essential maintenance task.
