When the engine is working, metal wear debris, dust, carbon deposits oxidized at high temperatures, colloidal deposits, and water are constantly mixed into the lubricant. The function of the oil filter is to filter out these mechanical impurities and gums, to keep the lubricating oil clean, and extend its service life. The oil filter should have a strong filtering capacity, low flow resistance, and long service life. Generally, several filters with different filtering capacities are installed in the lubrication system-filter collector, coarse filter, and fine filter, which are connected in parallel or in series in the main oil passage respectively. (The one connected in series with the main oil passage is called a full-flow filter. When the engine is working, all lubricating oil is filtered by the filter; the one connected in parallel is called a split-flow filter). Among them, the coarse filter one is connected in series in the main oil passage, which is a full-flow type; the fine filter is connected in parallel in the main oil passage, which is a split flow type. Generally, only a filter and a full-flow oil filter are installed on modern car engines. The coarse filter filters out impurities with a particle size of 0.05mm or more in the oil and the fine filter is used to filter out fine impurities with a particle size of 0.001mm or more.

oil filter
oil filter type


Oil filter, also known as oil grid. Used to remove impurities such as dust, metal particles, carbon deposits, and soot particles in the engine oil to protect the engine.

2. Specifications

a.Why should we notice?

In fact, there are too many types of oil filter elements. Because each model is different, the type of oil filter element is also different. There are oil filter elements for screw air compressors, WK962/7, WK940/20, and there are many, because If the car model is different, even if it is a little bit too close, you can’t put it in. Not only the organic oil filter element but also the fuel filter element are changed according to people’s needs. PL421, PL420 with cable. This is also the model of the oil filter element. There are many models. Many, you still need to look at your own model.

b.What should we pay attention to when buying oil filter?

First of all, when we buy, we must first ask if it is the original manufacturer. Because the original factory is better to use than the non-original factory, the focus is on the less damage to the car, but the original factory’s price will be a little more expensive than the non-original factory. We still need to look at our own economic conditions, if we can The editor still recommends buying the original factory, after all, we all hope that our car has a longer lifespan. Also, we have to see whether it is brand new, because some unethical manufacturers will install it in the car, so it is better for the car owner to stand by the side when replacing it, although this is not the case. But still need to pay attention to avoid this situation.

c.How to determine the oil filter specification?

If the car maintenance manual is still there, just check the contents of the maintenance manual, it will be mentioned in it. If the maintenance manual is gone, choose it carefully. Different models have corresponding machine filter models. If you make a mistake, you will not be able to install it smoothly. The machine filter you bought may be wasted, unless the place where you bought it allows return.

Oil Filter Brands



A qualified oil filter element is composed of a shell, threaded accessories, check valve, sealing ring, filter element, pressure spring, bypass valve, etc.

4.The filter materials

The filter materials used in the oil grid include filter paper, felt, metal mesh, non-woven fabric, etc.

5.Oil filter manufacturing

How is the oil filter made? The manufacturing process of oil filters usually starts with the manufacture of different parts according to the manufacturer’s design. It involves embossing and cutting shells, tapping plates and other parts from steel plates. Punch and cut another steel plate to make a center tube.

After that, the caries part enters the extrusion and welding stage. At the same time, the filter media is pleated in preparation for insertion into the filter housing. The process ends with assembling the various parts, checking, painting and packaging the finished oil filter.

During the manufacturing process, extreme care must be taken when selecting the materials to be used. In addition, in the design. Manufacturers conduct various tests to confirm specific values such as the efficiency, performance, and durability level of the oil filter. Some of these values are indicated for the user, while other values are reserved for the manufacturer.

6. Amisconception in oil filters 

A misunderstanding of oil filters is that if there is less material inside, the effect will be poor. This is not the case; not all filter materials are the same. In fact, there are many forms of materials on the filter market. The amount of material does not always determine the efficiency or capacity of the filter.

7.Oil filter classification/Types

  • replaceable type, spin-on type, and centrifugal type.

According to the structure, the oil filter can be divided into replaceable type, spin-on type, and centrifugal type.

  • full flow type and split flow type.

According to the arrangement in the system, the oil filter can be divided into full flow type and split flow type. The full-flow filter is connected in series between the oil pump and the main oil passage, so it can filter all the lubricating oil entering the main oil passage. The split-flow cleaner is connected in parallel with the main oil passage to filter only part of the lubricating oil sent by the oil pump.

  • The microporous filter paper filter element

Now the most common oil filter element on the market is basically a microporous filter paper filter element. It is a special filter paper impregnated with this resin. After heat curing treatment, its stiffness and strength are increased, and then it is installed in an iron shell. The shape is maintained better, and it can withstand a certain pressure, the filtering effect is also better, and it is relatively cheap. The life of this machine filter is calculated according to its filter effectiveness. It’s not that you have to use the machine until the filter is blocked and the oil can’t pass. It is the end of life. It means that its filtering effect is poor, and it can’t play a good cleaning effect, even if it is at the end of its life.

bypass filter and full flow filter
  • Mechanical

The mechanical design uses elements made of bulk materials (for example, cotton waste) or pleated filter paper to capture and isolate suspended contaminants. As materials accumulate on (or inside) the filter media, the flow of oil is gradually restricted. This requires regular replacement of the filter element (if the filter element cannot be replaced individually, the entire filter is required).

  • Magnetic

Electromagnetic filters use permanent magnets or electromagnets to capture ferromagnetic particles. One advantage of magnetic filtration is that maintenance of the filter only requires cleaning particles on the surface of the magnet. Automatic gearboxes in vehicles usually have a magnet in the liquid pan to isolate magnetic particles and extend the service life of the medium-type oil filter. Some companies are making magnets attached to the outside of oil filters or magnetic drain plugs-first invented and supplied to cars and motorcycles in the mid-1930s to help trap these metal particles, despite ongoing debate. The effectiveness of this equipment.

  • High efficiency (HE)

The high efficiency oil filter is a bypass filter that is said to extend the oil drain interval. The pore size of the HE oil filter is usually 3 microns, and studies have shown that it reduces engine wear. Some teams have been able to increase the drain interval by as much as 5-10 times.

oil filter
oil filter

What does an Oil Filter Do?

  1. Reason/ Why need an oil filter

Under normal circumstances, various parts in the engine are lubricated by oil to achieve normal operation, but the metal chips, dust, carbon deposits oxidized at high temperature, and some water vapor will be continuously mixed in when the parts are running. In the oil, the service life of the oil will be reduced if the time is long, and it may affect the normal operation of the engine in severe cases. Therefore, the role of the oil filter is reflected at this time.

  1. Function

Generally speaking, the oil filter element is the oil filter. The main function is to filter the debris and moisture in the oil and transport the cleaned oil to the parts that need lubrication. This is the function of the oil filter element. Both large and small vehicles need an oil filter element. Only with an oil filter element can the oil entering the parts that need lubrication to be free of impurities. Simply put, the main function of the oil filter is to filter most of the impurities in the oil, keep the standby oil clean, and extend its normal service life.

In addition, the oil filter should also have the performance of strong filtering capacity, low flow resistance, and long service life.

On the other hand, it can effectively reduce friction and wear, and at the same time transfer the heat generated by combustion and friction to the cooling circuit, and prevent oil Deteriorate and reduce engine wear.

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