2. For the poor quality oil filter, it is used the low quality of glue and with less. What’s worse, it’s not kind of oil resistant, but can’t  be bonde firmly. In this way, it results in short-circuit. For another, the filter element seams using staples, can’t be  sealed well and short circuit, so that a large number of harmful impurities well get into the engine and reduce engine life.   

3. For the poor quality, it is used the ordinary rubber to instead of the oil resistanted rubber. It’s easy to cause inner short-circuit filter during using and results in early engine wear and tear. Or because of the the expansion of the external seal deformation,it’ll cause the outside ring come out and a large of oil will be spilt. What’s worse, it will make the engine buning tile, holding axis and suffered serious damage.

4. For the poor quality of oil filter, it’ll used the thin kind of tube material instead of the thick one. The interstity of thin one is not enough. When we using it, the tube will be deflated. Thus it easy to make the filter break and result in insufficient engine lubrication.

5. If the cap of filter, the center tube, outer body and other metal parts are not making the rust treatment, it’ll cause many dust. In this way, it’ll make the filter to be a pollution sourse. What’s worse, some even use the sement instead of glue, it has more harmful.

So in order to make the engine work efficiency, we should maintance and replace the filter regularly.