Oil filter, also known as oil grid. It is used to remove impurities such as dust, metal particles, carbon precipitates and soot particles in the oil to protect the engine.
Oil filter has full flow and shunt type. The full-flow filter is connected in series between the oil pump and the main oil passage, so it can filter all the lubricating oil entering the main oil passage. The shunt cleaner is in parallel with the main oil passage, and only part of the lubricating oil sent by the filter oil pump is filtered.

Installation and use
 

Filter paper: The oil filter has higher requirements for filter paper than the air filter, mainly because the temperature of the oil varies from 0 to 300 degrees, and the concentration of the oil also changes accordingly under the drastic temperature change, which will affect the filter flow of the oil. The filter paper of the high-quality oil filter should be able to filter impurities under severe temperature changes while ensuring sufficient flow.
Rubber seal ring: The filter seal ring of high-quality oil is made of special rubber, which guarantees 100% no oil leakage.
Backflow suppressor valve: Only available in quality oil filters. When the engine is turned off, it can prevent the oil filter from drying out; When the engine is reignited, it immediately creates pressure and supplies oil to lubricate the engine. (Also known as stop-return relief valve: only high-quality oil filters are available. When the external temperature drops to a certain value or when the oil filter exceeds the normal service life limit, the relief valve opens under special pressure, allowing the unfiltered oil to flow directly into the engine. Even so, the impurities in the oil will enter the engine together, but the damage is much less than the damage caused by the absence of oil in the engine. Therefore, the relief valve is the key to protect the engine in an emergency.