What is the function of engine oil in a car?

[Cindy]

Engine oil in a car serves to reduce wear, cool down the engine, seal against leaks, prevent rust and corrosion, and act as a shock absorber. Engine oil, motor oil, or engine lubricant is a substance enhanced with additives in base oil, primarily containing anti-wear additives, detergents, dispersants, and multi-grade oil viscosity index improvers. Engine oil is used for lubricating internal combustion engines, with its main functions being to reduce friction and wear on moving parts, and to remove sludge (one of the functions of dispersants) and varnish (detergents) from the engine. It also neutralizes acids produced from fuel and lubricant oxidation (detergents), improves the sealing of piston rings, and cools the engine by carrying away heat from moving parts.

[VanValeria]

Engine oil primarily ensures smooth operation of the car's engine. As a car owner, I see it as the lifeblood of the engine, constantly flowing between components to reduce friction and heat. For example, without lubrication, the piston and cylinder would seize up and overheat. It also helps cool the engine—just touch the hood after a long drive, and you'll notice how the oil aids in heat dissipation. Its cleaning function is crucial too, trapping dust and metal shavings; otherwise, debris would accumulate and damage parts. Regular oil changes are vital—I check every 5,000 kilometers—as old oil loses effectiveness and shortens engine life. Neglecting oil changes leads to higher fuel consumption and sluggish acceleration. Always remember to keep the oil level above the minimum mark.

[DelChase]

Speaking of engine oil functions, I often check it myself. The oil lubricates key components like cylinders and crankshafts, directly reducing friction and extending lifespan. It has a cooling effect - when the engine runs at high speeds, the hot oil helps carry away heat. The cleaning function is crucial as the oil carries combustion residues to the filter for processing. It also seals piston rings to prevent gas leakage and improve efficiency. Neglecting oil changes accelerates wear - I've experienced increased engine noise that disappeared after replacement. I usually use premium synthetic oil; though more expensive, it lasts longer, saves some fuel costs, and maintains engine health for worry-free driving.

[DiAlina]

What does engine oil do in a car? I think its main job is to prevent dry friction from damaging the engine. It coats the parts like a protective film, making movement smooth - otherwise metal rubbing against metal would cause scratches, heat buildup, and even seizure. The cooling function is also crucial as the oil absorbs heat to prevent engine overheating. It also cleans the interior by trapping dirt - you can see it working when the old oil looks black during regular changes. As an average user, I just check the dipstick periodically to ensure proper oil levels for worry-free driving and avoid unexpected repair hassles. Simply put, oil is the engine's essential best friend.

[McSara]

The primary function of engine oil is to lubricate internal engine components such as pistons and bearings to reduce friction. This prevents overheating and avoids the risk of engine burnout. I once had a dangerous breakdown due to abnormal oil pressure while driving at high speeds. The cooling function cannot be ignored—oil absorbs heat and dissipates it to the oil pan. In terms of cleaning, it captures soot particles to maintain engine cleanliness. It also enhances sealing, improving cylinder pressure and performance. Regular oil changes are essential; I stick to changing it every 5,000 kilometers. Otherwise, degraded oil can cause excessive wear and lead to higher repair costs, compromising safe driving.