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How the petrol particulate filter works and what you should know about it

petrol particulate filter

The petrol particulate filters or GPF are a relatively new technology that is becoming increasingly common in modern automobiles.

These filters are designed to capture and remove particulate pollutants from the air before they leave the tailpipe, significantly reducing the amount of pollution emitted by vehicles.

Petrol Particulate Filter - GPF

How do particulate filters for petrol vehicles work?

Particulate filters for petrol vehicles work in a similar way to diesel particulate filters.

They consist of a porous material which allows the flow of exhaust gases, but traps particulate pollutants.

This porous material can be made of different materials, such as ceramics, fibreglass or metals, depending on the design and brand of the particulate filter. 

In addition, some gasoline particulate filters may have a automatic cleaning system which uses a special liquid to dissolve the captured particles and allow the filter to continue to operate efficiently.

The filter is placed in the exhaust system of the vehicle, usually near the catalytic converter.

When exhaust gases pass through the filter, carbon particles and other pollutants are trapped on the surface of the porous material.

As particulate matter accumulates, the filter becomes less efficient and must be cleaned or replaced. The frequency of maintenance depends on the type of filter and vehicle usage.

What is the difference between petrol particulate filters and diesel particulate filters?

Although particulate filters for petrol and diesel vehicles have the same objective of capturing and removing particulate pollutants, there are some important differences between them:

Material composition

 diesel particulate filters are usually composed of ceramic materials, while particulate filters for gasoline vehicles usually use porous glass fibre or metal materials.

Type of particles

 diesel particulate filters are mainly used to capture soot particles, which are larger and denser than the particles in the exhaust gases of gasoline-powered vehicles. 

Petrol particulate filters focus on capturing smaller particles, such as carbon particles and other fine particles that can be harmful to health.


Diesel particulate filters require more frequent maintenance than petrol particulate filters. 

This is because soot particles captured in the filter of a diesel vehicle can clog the filter more quickly, which can affect engine performance. 

In comparison, particulate filters for petrol vehicles can last longer before requiring maintenance.


Petrol and diesel particulate filters have some important differences in terms of composition, type of particles captured and maintenance required.

They are designed according to the regulations for:

Reduce air pollution: By capturing and removing particulate pollutants from the air, petrol particulate filters help reduce air pollution and improve air quality in urban areas.

Comply with regulations: In many countries, particulate filters for petrol vehicles are a legal requirement to comply with vehicle emission regulations. Installing a particulate filter on a petrol vehicle can help to comply with these regulations and avoid fines and penalties. More now with the new Euro 7 standard.

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