What is the lubrication principle of engine oil?

[EdwardMarie]

The lubrication principle of an engine involves the main oil pump drawing lubricating oil from the oil pan and then pumping it into the oil cooler. The cooled lubricating oil passes through the oil filter for purification before entering the main oil pipe at the lower part of the engine block. Under pressure, it is then delivered to various lubrication points. The functions of the lubrication system include: Lubrication: Lubricating the surfaces of moving parts to reduce friction resistance and wear, thereby decreasing engine power consumption. Cleaning: The continuous circulation of oil within the lubrication system cleans friction surfaces, carrying away wear debris and other foreign particles. Cooling: The continuous circulation of oil also carries away heat generated by friction, serving a cooling function. Sealing: Forming an oil film between moving parts enhances their sealing properties, helping to prevent gas or oil leaks. Anti-corrosion: The oil film formed on part surfaces protects them from corrosion and rust. Hydraulic function: Lubricating oil can also serve as hydraulic fluid, such as in hydraulic lifters, providing hydraulic pressure. Vibration damping: The oil film formed on moving part surfaces absorbs impacts and reduces vibration, serving as a shock absorber. Lubrication methods include: Pressure lubrication, splash lubrication, and periodic lubrication.

[ElliotFitz]

Hmm, the principle of engine oil lubricating an engine is quite fascinating. Imagine when you start the engine, the oil pump kicks in, sucking oil from the oil pan and forcing it onto various moving parts. In places like piston rings and bearings, the oil forms an ultra-thin oil film, acting like a protective layer that separates the metal surfaces, preventing direct friction—that’s why it reduces wear and heat. This oil film is maintained by the oil’s viscosity and pressure, and as temperatures rise, the viscosity must adapt accordingly; otherwise, the protection fails. If the oil is too dirty or degraded, the oil film breaks down, leading to increased engine noise or even damage. When driving normally, remember to check the oil quality regularly and choose the right viscosity grade to extend your engine’s lifespan.

[SanIsla]

Having been in this industry for decades, I've seen how engine oil protects the engine. The core lies in the lubricating effect of the oil film: the oil is pumped to circulate through components like the crankshaft and pistons, forming a microscopic layer between metal parts to prevent dry contact friction. Oil viscosity is crucial—higher viscosity during cold starts ensures initial lubrication, while viscosity decreases during operation to maintain flow. Additives like anti-wear agents enhance protection, but over time, they degrade, rendering the oil ineffective. Regular oil changes are essential—don't wait until the oil turns black, or increased friction will damage parts and cause valve issues. Remember, change the oil every 5,000 to 10,000 kilometers, depending on the vehicle's condition. Using high-quality oil ensures smoother engine performance.

[MacPaul]

As someone who drives every day, I deeply understand that engine oil is the guardian of the engine. The principle is simple: the oil is pumped into the gaps of the engine, coating the surfaces of moving parts to prevent metal-to-metal friction, reducing heat generation and wear. For short daily trips, the oil film remains intact, keeping the engine quiet. If the oil is too old, the protective layer thins, potentially triggering an overheating warning. Just change the oil regularly—don’t skimp on this small expense to avoid major repair costs. Protecting the engine ensures peace of mind for family trips.