Why do cars need engine oil maintenance?

Motor oil is the working fluid of the engine lubrication system. It has the functions of lubrication, cooling, sealing, cleaning, etc. It can be said that the quality of the oil directly affects the performance and life of the engine. But why does the entire engine oil need to be changed? What is the purpose of oil change maintenance? Let’s talk about it below.

Why do cars need to change their oil?

1. Everyone basically knows the lubrication function of engine oil, but during the lubrication process, the engine oil will be gradually consumed, and impurities will be produced, which will affect the lubrication effect of the engine oil, so it needs to be replaced regularly

2. Cooling is also a function of engine oil. After long-term use of engine oil, the cooling effect will also be reduced.

3. Mechanical work efficiency with good sealing properties will also increase. Due to long-term use and heat generation of engine oil, chemical reactions will inevitably occur and reduce its sealing properties.

4. The engine oil takes away the impurities and metal wear products produced when the engine is working, but it will not be eliminated from the body, so this is one reason why the engine oil needs to be replaced frequently.

5. The engine oil will also gradually decrease during use. When the piston moves downward, an oil film will form on the cylinder wall. When the piston works at high speed, some oil will be sucked into the combustion chamber and burned together with the mixed gas.

Engine oil has four major functions: cooling, lubrication, cleaning and sealing. It plays a vital role in ensuring the normal operation of the engine. As the engine working hours increase, the engine oil becomes contaminated due to factors such as high-temperature oxidation, wear and tear of mechanical parts, and corrosion of fuel vapor. In addition, engine oil must be consumed to a certain extent during normal use. Therefore, we need to regularly check the oil level and its degree of contamination, which is why we need to change the oil regularly. If the engine oil is lower than the specified value and affects the operation of the engine, it will cause fatal damage to the engine.

The role of engine oil

Lubrication: The main function of engine oil is lubrication. It can form an oil film on the surface of the metal parts of the engine and reduce the wear of the metal surface.

Cleaning: Decompose the sludge and sediment produced during engine use and keep the inside of the engine clean.

Anti-rust: Neutralizes acidified substances produced during use in the engine and forms an anti-rust and anti-corrosion layer to prevent metal parts from rusting and corroding due to oxidation.

Sealing: seals the gap between the piston and the cylinder to ensure full combustion of fuel and improve fuel efficiency.

Cooling: Disperses the high temperature generated by engine wear and protects various engine components.

Usually when you buy a car, the car manufacturer will provide a car repair and maintenance manual with the car. The manual lists the vehicle's oil change mileage, that is, the oil change interval. Most cars are between 5,000 and 10,000. kilometer. Generally, the car's engine oil should be changed when the specified oil change mileage is reached. In some high-end vehicles, an oil change prompt will appear in the car when the oil change mileage is reached.

What is the purpose of oil change maintenance?

If the engine oil is lower than the specified value and affects the operation of the engine, it will cause fatal damage to the engine.

Oil is used to lubricate pistons, piston rings and cylinders. When the piston moves downward, it will leave an oil film on the cylinder wall. When the vehicle decelerates, the high negative pressure generated draws some of this oil into the combustion chamber. This oil, like part of the oil film left on the cylinder wall, is burned by the high-temperature combustion gas during the combustion process.

Oil is also used to lubricate the intake valve stem and is sucked into the combustion chamber. High-temperature exhaust gases will also burn the oil used to lubricate the exhaust valves.

As the age of any car increases and the mileage increases, its technical condition will gradually deteriorate: the body will lose its former luster, the fastened parts will become loose, and the coordination of the parts will not work. The gap will increase due to wear and tear, and various vehicle protective fluids such as engine oil, transmission oil, and coolant in the car will coke, scale, deteriorate, and fail. These vehicle protective fluids are just like the blood of the human body. It provides necessary "nutrition" to all parts of the car. If not replaced in time, it will affect the normal operation and service life of the car, and even lead to serious accidents.

Coupled with the current deterioration of the traffic environment.

Crowded roads in the city. Stop-and-go driving at slow speeds is the worst for the engine and oil. This situation is most likely to produce sludge.

Causes the rapid deterioration of the engine oil, resulting in the car's inability to accelerate, increased fuel consumption, increased noise, reduced control performance, etc. Therefore, various vehicle protective fluids must be replaced regularly;

Nowadays, Urban roads are becoming more and more crowded, and slow stop-and-go driving is a more severe test on engine oil. This situation can easily produce sludge, which is detrimental to both the engine and the engine oil.

General oil change intervals are between 5,000 and 10,000 kilometers. The oil should be changed when the specified oil change mileage is reached. In some high-end vehicles, an oil change prompt will appear in the car when the oil change mileage is reached. Of course, in actual driving, road conditions, vehicle conditions, and engine oil quality will all affect the oil change interval. As mentioned above, frequent stops and starts in cars will increase engine wear and accelerate oil pollution, so the oil change interval should be shortened.

It is very important to perform necessary inspections, adjustments, tightening, and lubrication of various vehicle components on a regular basis! If you don't pay attention to maintenance, waiting for the car to break down before repairing it will only end up wasting time, trouble and money. Paying attention to maintenance is the best way to keep your car looking young.