1. Use low-priced filter paper to make the filter element. Because of its large pore size, poor uniformity and low filtration efficiency, it cannot effectively filter out harmful impurities to the engine, causing early engine wear.

2. Use low-quality adhesive, and the amount is very small. It is neither oil-resistant nor firmly bonded, which causes short-circuit of the filter element bonding; or the filter element seam is connected with staples, which cannot be sealed and short-circuited, allowing a large amount of harmful impurities to enter Engine, reduce engine life.

3. Replace the oil-resistant rubber parts with ordinary rubber parts. During use or due to the failure of the internal seals, the internal short-circuit of the filter results in early engine wear, life reduction or expansion and deformation of the external seals, resulting in the outer seal of the oil filter The ring was extruded, and a large amount of oil was drained in a short time, causing the engine to burn bushes, hold the axle and suffer serious damage.

4. Spot welding is used to replace seam welding at the welding part of the air filter housing, which cannot guarantee the tightness and forms a short circuit.

5. The material of the center tube of the oil filter is thinner instead of thicker, and the strength is not enough. In the process of use, the center tube is collapsed, the filter element is damaged and the oil path is blocked, resulting in insufficient lubrication of the engine; Turn on, causing a large amount of oil to leak in a short period of time, causing bush burning and axle holding.

6. Metal parts such as filter element end cover, center tube, shell, etc., are not treated for rust prevention, which causes metal rust to produce impurities and makes the filter a source of pollution. What's more, replacing adhesives with cement is more harmful.

Therefore, inferior filters are costly. It is recommended that users be cautious when replacing filters. It is best to choose original parts to avoid unnecessary economic losses.

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