1. The use of low-cost and poor filter paper production filter, because of its large filter aperture, poor uniformity, low filtration efficiency, the engine can not be effectively filtered impurities impurities, causing early wear and tear of the engine.

2. The use of low-quality adhesives, and the amount of very little, neither oil, they can not be firmly bonded, resulting in short-circuit filter bonding; or filter seams using staples, can not be sealed and short circuit, so a lot of harmful impurities into Engine, reduce engine life.

3. The ordinary rubber parts instead of oil-resistant rubber parts, or in the process of internal seal seal failure to form a filter internal short circuit caused early wear and tear of the engine, life reduction or due to the expansion and deformation of the external seal, resulting in oil filter seal Extrusion circle, a large number of Drainage within a short period of time, so that the engine bush, hold the shaft, suffered serious damage.

4. Air filter shell welding parts instead of spot welding seam welding, can not guarantee the tightness, the formation of short circuit.

5. The center of the oil filter tube material with a thin thickness, strength is not enough, because in the course of the center tube suction deflated, filter plugging damaged oil, resulting in insufficient lubrication of the engine; or seams at the poor reliability, the use of the process of seizing the mouth Open, resulting in a large number of oil spills in a short time, resulting in burning tile, axle.

6 filter cover, the center tube, shell and other metal parts, without rust treatment, resulting in corrosion of metal impurities, so that the filter has become a source of pollution. What is more, cement instead of adhesives, the more harmful.

Therefore, the inferior filter cost is very large, we suggest that users must be careful when replacing the filter. It is best to use the original parts to avoid unnecessary economic losses.