1、 The function of the oil filter is to filter out impurities
In general, various components of the engine are lubricated with engine oil to achieve normal operation. However, the metal debris, dust entering, carbon deposits oxidized at high temperatures, and some water vapor generated during component operation will continuously mix into the engine oil. Over time, this can reduce the normal service life of the engine oil, and in severe cases, it may affect the normal operation of the engine.
Therefore, at this point, the function of the oil filter is reflected. Simply put, the main function of an oil filter is to filter out the vast majority of impurities in the engine oil, ensuring its cleanliness and extending its normal service life. In addition, oil filters should also have strong filtering ability, low flow resistance, and long service life.

2、 Oil filter composition: housing filter element
The oil filter mainly consists of two parts: filter paper and housing. Among them, there are also auxiliary components such as sealing rings, supporting springs, and bypass valves
The function of the bypass valve is that when the filter paper fails due to excessive impurities, oil will flow into the engine through the bypass valve for lubrication. From the appearance alone, what we see is only the oil filter as a whole, and parts such as filter paper and bypass valve cannot be seen.

3、 Oil filter maintenance cycle: belongs to vulnerable parts
The oil filter is a vulnerable part, and in general, the warranty for the oil filter should be carried out according to the manufacturer's specified usage mileage. In terms of filter replacement, the oil and oil filter are replaced together. If used for a long time without replacement, it may lead to the loss of oil filter function, ultimately affecting engine operation.

4、 Disassembly and assembly of oil filter
The disassembly and assembly of the oil filter is carried out during maintenance at a 4S store, and car owners generally do not replace it themselves. When replacing the oil filter, the vehicle should first be raised through a lift, and then the oil plug located on the oil pan should be unscrewed for oil drainage. After the old engine oil in the car is completely drained, you can use an oil filter wrench to unscrew the old oil filter. When the engine oil in the car is basically no longer leaking, you can install a new oil filter. During installation, the mechanic will apply a layer of engine oil on the new oil filter to achieve a better sealing effect.

5、 Method for distinguishing the quality of oil filters:
1. In terms of appearance: there are differences between delicate and rough appearance
Poor quality oil filters, with rough printing on the surface of the housing and often blurry fonts. The factory logo font on the surface of the genuine oil filter is very clear, and the surface paint texture is very good. Careful friends can easily distinguish differences through comparison.
2. In terms of filter paper: the difference in filtering ability
The ability of fake oil filters to filter impurities is relatively poor, which is mainly reflected in the filter paper. If the filter paper is too dense, it will affect the normal flow of oil; If the filter paper is too loose, it will cause a large amount of unfiltered impurities to continue to flow with the engine oil. Over time, this can lead to dry friction or excessive wear of the engine components.
3. In terms of bypass valves: there are two types of auxiliary functions
A bypass valve is a device used for emergency oil delivery when the filter paper is clogged due to excessive impurities. However, the built-in bypass valve of most fake oil filters does not have a significant effect, so when the filter paper fails, the oil cannot be delivered in a timely manner, which can lead to dry friction of some components inside the engine.
4. In terms of gaskets, there are differences between sealing and oil leakage
Although the gasket may seem inconspicuous, the sealing between components relies entirely on it. The gasket material in a fake oil filter is relatively poor, and under high temperature and high-intensity operation of the engine, it is likely to cause its sealing failure, ultimately leading to oil leakage.