The oil filter, also known as the oil filter, is an indispensable component in the lubrication system of the automobile engine. 

The following is a detailed introduction:

Function

• Filter impurities: remove impurities such as dust, metal particles, carbon sediments and soot particles in the oil to prevent

 them from entering the engine and reduce parts wear.

• Protect the engine: ensure the cleanliness of the oil, allow pure oil to enter the engine, ensure the normal operation of the

 engine, and extend the service life of the engine.

• Maintain the performance of the oil: prevent moisture, sludge, oil residue, etc. in the oil from entering the engine, avoid corrosion

 to the engine, reduce the lubrication performance of the oil, and affect the normal flow of the oil.

Classification

• According to the filtering method: the full-flow filter is connected in series between the oil pump and the main oil channel, and can

 filter all the lubricating oil entering the main oil channel; the split-flow filter is connected in parallel with the main oil channel and 

only filters part of the lubricating oil sent by the oil pump.

• According to the structural form: the common ones are spin-on oil filters, which are installed or disassembled by rotation, have an

integrated shell and filter element, are easy to replace, and are widely used; there are also disposable oil filters, which are relatively low in price, 

need to be replaced regularly, and are suitable for routine maintenance; and reusable oil filters, which restore the filtering function by cleaning 

and replacing the filter element, are durable but require regular maintenance.

Composition

It is mainly composed of two parts: filter paper and shell. In addition, there are auxiliary components such as sealing rings, support springs, 

bypass valves, backflow suppression valves, and overflow valves.

Working principle

• Pure mechanical separation: Use the small holes on the filter material to block solid particles and keep them on the outer surface of the filter material.

• Centrifugal separation: Through the high-speed rotating rotor, the impurities in the oil are thrown to the inner wall of the rotor under 

the action of centrifugal force, thereby separating from the oil.

• Magnetic adsorption: Use permanent magnets to adsorb iron particles in the oil to prevent them from circulating in the oil and causing 

damage to the engine.

Replacement cycle

The oil filter of general cars and commercial vehicles is replaced every six months. It is recommended to replace it regularly according to 

the vehicle's manual and actual usage.