1. Filter Paper

Oil filter on filter paper requirements, higher than the air filter, high quality oil filter filter paper needs to be in the oil temperature change, smooth filtering impurities, and ensure sufficient flow.

Cheap cotton made use of filter paper, filtering effect is poor, easy to decompose into oil, blocking oil, accelerate oil deterioration, resulting in engine damage.

2 Rubber Sealing Ring

High quality oil filter sealing ring, the use of special rubber compound, to ensure that 100% does not leak oil.

Good oil filter, in the case of normal installation, will not leak. Cheap oil filter oil leakage problem is serious.

3. Return Valve

Only high quality oil filter has the return valve, when the engine off, it can prevent the oil filter dry; when the engine reignition, it immediately generates pressure, then supply of oil lubrication engine.

Cheap oil filter do not have valve, so it may speed up the wear of engine .

4. Bypass Valve

Only high quality oil filter has the bypass valve, when the oil filter out of the normal use of the time limit, the bypass valve will be under special pressure to open, to ensure that the engine has sufficient oil supply.

Cheap oil filter do not have bypass valve, in some special situation, without lubricating oil, it can make the engine scrap.