What filter media is used inside the oil filter to filter impurities in the oil?

Oil filters use various types of filter media to effectively capture and remove impurities and contaminants from engine oil. The choice of filter media depends on the filter's design, intended application, and filtration efficiency. Common types of filter media used in oil filters include:

Cellulose Paper: Cellulose filter media is made from wood pulp or other natural fibers. It is a cost-effective and widely used material for oil filters. Cellulose filter media provides good filtration efficiency and can capture particles down to about 20-30 microns in size.

Synthetic Fiber: Synthetic filter media is typically made from synthetic fibers such as polyester or glass fibers. Synthetic media offers higher filtration efficiency compared to cellulose and can capture smaller particles, often down to 10 microns or even smaller.

Blend of Cellulose and Synthetic Fibers: Some oil filters use a combination of cellulose and synthetic fibers to benefit from both materials' characteristics. This blend can provide a balance between filtration efficiency and cost-effectiveness.

Microglass: Microglass filter media is made from very fine glass fibers. It offers excellent filtration efficiency and can capture extremely small particles, including sub-micron contaminants. Microglass media is often used in high-performance and industrial applications.

Metal Screen or Mesh: In addition to or in combination with filter media, some oil filters have a metal screen or mesh element to capture larger debris and contaminants. This screen helps prevent large particles from entering the engine's lubrication system.

Depth Media: Depth media filters consist of multiple layers of filter material with varying densities. This design allows them to capture contaminants at different depths within the media, increasing their dirt-holding capacity and efficiency.