Diesel engines have four types of filters: air, oil, fuel, and cooling water, commonly known as the "four filters". They are respectively responsible for filtering impurities in the engine intake system lubrication system, combustion system, and cooling water system.

The most harmful factors to the performance and lifespan of diesel engines are impurities and pollution entering the engine. They are the first "killers" of engines. Filters are the only way to avoid impurities, particles, and pollution. With the advancement of engine technology, the requirements for filters are becoming increasingly high.

Due to the uneven quality of filter manufacturers. The filter was originally designed to filter harmful impurities from various substances entering the diesel engine. Enable the engine to operate normally under various working conditions and achieve the specified service life.

However, counterfeit, especially inferior filters, not only fail to achieve the above effects, but also bring various hazards to the engine. Common hazards include the following:

1. Using low-cost filter paper to make filter cartridges, due to its large pore size, poor uniformity, and low filtration efficiency, it cannot effectively filter out harmful impurities from substances entering the engine, resulting in early engine wear.

2. Using low-quality adhesive cannot firmly bond, causing a short circuit at the bonding point of the filter element; Allowing a large amount of harmful impurities to enter the engine will reduce the lifespan of the diesel engine.

3. Replace oil resistant rubber parts with ordinary rubber parts. During use, due to the failure of internal seals, a short circuit is formed inside the filter, causing some oil or air containing impurities to directly enter the engine. Causing early engine wear and tear.

4. The material of the center tube of the oil filter is thin instead of thick, and its strength is insufficient. During use, the center tube may shrink and the filter element may be damaged, blocking the oil circuit, resulting in insufficient engine lubrication.

5. Metal components such as filter end caps, center tubes, and casings are not treated with rust prevention, resulting in metal corrosion and impurities, turning the filter into a source of pollution.