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Why do I have to change the oil filter every time I maintain it?


Release time:

2024-09-30

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Every time you go to maintenance, it is necessary to replace the three cores and the oil, and the three cores include the oil filter element. The function of the oil filter element is to filter out debris, colloids and moisture in the oil, and deliver clean oil to each lubricating part. If the oil is not filtered and directly enters the lubricating oil circuit, the debris contained in the oil will be brought into the friction surface, which will accelerate the wear of parts and reduce the service life of the engine.

Every time you go to maintenance, it is necessary to replace the three cores and the oil, and the three cores include the oil filter element. The function of the oil filter element is to filter out debris, colloids and moisture in the oil, and deliver clean oil to each lubricating part.

If the oil is not filtered and directly enters the lubricating oil circuit, the debris contained in the oil will be brought into the friction surface, which will accelerate the wear of parts and reduce the service life of the engine.

1. The working principle of engine oil

Engine oil is the blood of a car engine. Its first major function is lubrication. It can reduce the friction between the various moving parts of the engine. Once the engine oil is lacking, it will cause irreversible wear to the engine.

In order to reduce the frictional resistance between the relative moving parts in the engine and reduce the wear of the parts, the oil is continuously delivered to the friction surface of each moving part to form a lubricating oil film for lubrication.

In addition, the oil film formed by the oil can also prevent excessive combustible mixed gas from passing through the gap between the piston ring and the cylinder wall, so it can also play a sealing role.

2. Engine oil will deteriorate

The engine oil itself contains a certain amount of colloids, impurities, moisture and additives. With the movement of the piston, the engine oil will be affected by high temperature and incomplete combustion of gasoline, and gradually oxidized and polluted, so the engine oil will become dirty, black and thick.

At the same time, during the working process of the engine, the introduction of metal wear debris, the entry of debris in the air, and the generation of oil oxides make the debris in the oil gradually increase.

If the oil is not filtered, the impurities in the oil will damage the crankshaft, connecting rod, piston ring, etc.

3, the role of machine filter

The oil filter element can filter out harmful impurities and exclude impurities such as metal wear debris and carbon deposits.

When the filter is working normally, the oil inlet check valve will open. Under normal conditions, the bypass valve is closed. After all the oil enters the filter, it will flow out through the filter paper. At this time, the oil flowing out is clean oil.

Under special circumstances, if the filter paper cannot be filtered in time, in order to ensure the normal supply of oil, the bypass valve will open. For example, when the filter is not replaced for a long time, the filter paper is seriously blocked. Or cold start or low temperature outside, the oil is very viscous, the bypass valve will open.

Once the bypass valve is opened, it means that the oil enters the engine without filtration or complete filtration, so that the oil with impurities and even metal debris will enter the engine and cause wear to the engine.

Therefore, for the life of the car engine, we should try to replace the oil filter element during each maintenance. Once the engine is worn out, the loss cannot be solved by the money of a few filter elements.

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