Oil filter, also known as "oil filter". It is used to filter impurities such as dust, metal particles, carbon deposits, soot particles, and colloids in the engine oil to protect the engine and extend its service life.

l Filter paper:

The oil filter has higher requirements for filter paper than the air filter, mainly because the temperature of the oil changes from 0 to 300 degrees. The filter paper of a high-quality oil filter must be able to filter impurities under drastic temperature changes. At the same time, And ensure sufficient traffic.

l Rubber sealing ring:

The high-quality oil filter sealing ring is made of special rubber to ensure 100% no oil leakage.

l Backflow suppression valve:

Only found in high-quality oil filters. When the engine is turned off, it prevents the oil filter from drying out; when the engine is re-ignited, it immediately generates pressure to supply oil to lubricate the engine. (also called check valve)

l Relief valve:

Only found in high-quality oil filters. When the external temperature drops to a certain value or when the oil filter exceeds the normal service life, the relief valve will open under special pressure, allowing unfiltered oil to flow directly into the engine to lubricate the friction parts - not yet Filtered impurities can increase engine wear. Therefore the relief valve is key to protecting the engine in an emergency. (also called bypass valve)