The oil filter magnets absorb metal particles from the oil, reducing the wear and tear on the engine and making it last longer.
How Do Oil Filter Magnets Work
Metal particles in the engine can cause wear and tear on engine parts. For this reason, many car owners take steps to minimize the amount of metal particles inside the engine when they maintain their vehicles. One way to do this is to add oil filter magnets to the outside of the oil filter. The functions of oil filter magnets are not complicated, as the metal particles are trapped under the action of a magnetic field, so that they do not follow the oil into the engine, reducing the wear and tear of metal particles on the engine.
The Role of Oil Filter Magnets
The maximum size of solid particles that an engine can tolerate is below 4 microns. Currently, the filtration standard of main oil filters is 20-30 microns. Why is the filtering accuracy so low? This is because when the engine is working, the pressure of the oil pump is very high, usually between 1.9-5 Pa. The oil is a very viscous liquid, so the filtration standard can not be too fine, otherwise it will block the engine.
Image Source: Denso & eBay
Moreover, the moving parts of the engine, such as the crankshaft, piston rings, camshaft, valve rods, and springs, are all Martensitic stainless steel parts, which are likely to produce metal particles. Considering the filtration standard of the oil filter, oil filter magnets help to improve the filtration of metal particles in the oil. In fact, automotive engineers have considered this point, so there are other means of adsorption of metal debris inside the engine. For example, at the bottom of the engine and the top of the oil drain screws, neodymium-iron-boron materials are used to adsorb metal debris.
It should be noted that the main impurities in the oil are carbon particles, aromatic hydrocarbon gum, non-magnetic metal particles, and magnetic metal particles. Carbon particles and aromatic hydrocarbon gum are the main impurities. Under normal circumstances, the engine metal wear and tear will not be very serious, so normal engine maintenance can solve the problem of metal particles in the oil. If oil filter magnets are used, the result will be even better.
Application of Oil Filter Magnets
Oil filter magnets reduce the amount of metal particles in the engine and provide protection for the engine. Since oil filter magnets are easy to operate and low-cost, almost all vehicles can benefit from them, especially those heavy trucks operating in harsh environments.
At the same time, it is important to take into account the effect that strong magnets can have on the electronics inside the vehicle, especially in higher-end models with more high-tech features. Therefore, before using oil filter magnets, vehicle owners need to have a thorough understanding of their vehicles.
Specifications of Oil Filter Magnes for Reference
Based on the customers’ demand, different kinds of magnets are used in the oil filters, such as neodymium magnets and ceramic magnets.

Image Source: Magnet-tool
Magnets: Ceramic-type magnets
Coating: Chrome Plated Case, wear resistance and durability.
Pull Force: 65 pounds
Measures: 2.5″ in diameter and 3/8″ in thickness
Magnetization Direction: Axial
The Installation and Maintenance of Magnetic Oil Filter
When installing the magnets, make sure they are securely fastened to prevent them from shifting or falling off during the operation of the vehicle.
Vehicle owners also need to regularly check the condition of the magnets, including whether the magnetic force of the magnets has weakened, and whether it is necessary to clean up the metal particles adsorbed on the magnetic oil filters.
Image Source: Cndailymag & Magnet-tool
Special Tips: High-grade Vehicles
For some high-end vehicles, due to the complexity of their internal electronic systems, the use of oil filter magnets should be evaluated in detail. If necessary, consult a professional maintenance personnel.
Additionally, car owners can use a high-quality oil filter to achieve the same protection, albeit at a higher cost, although it will prevent the magnets from affecting the electronic system.
Installing oil filter magnets is an easy and convenient way to protect your engine. Vehicle owners should install, use, and maintain oil filter magnets properly, depending on the condition of their vehicle.
Oil Filter Magnets Manufacturer
At Tengye, we’re thrilled to be early participants in your new product development. Our passion for cooperation extends from magnetic material selection and design optimization to injection molding service. We hope to bring our knowledge and experience to the forefront by actively engaging in your upcoming projects. For further information on bespoke magnet assemblies and magnet designs, please contact us via:
Phone: +86-571-86781912
Email: sales@tengye-magnetic.com
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