1.     For spin on filter, the right way to install is to use spin force in two kilogram and not use spanner. If the spin force is too big, it is likely to cause the distortion of sealing ring of the filter, under the strike of the high pressure airflow, the filter will cause gap and then cause leakage.

2.     The pollutant that the old oil filter touches is not managed to be clean.

3.     When dismantling the old oil filter, because of the over spin force before, the old sealing ring sticked on the filter and the new oil filter will leak.

4.     The lubrication system is polluted heavily, the oil dust blocked the main oil path and cause the inner pressure, striking the filter sealing ring and then cause the leakage.

5.     For eco-friendly element (paper element), mostly it is because of the sealing ring in the guide bar that not dismantled, while install the new oil filter sealing ring.

6.     When changing the eco-friendly element ( paper element) , it doesn’t change the new filter sealing ring.

7.      Eco friendly element ( paper element), for the over spin force of outer sealing ring of the filter, it would cause the serious distortion or hidden defect, it will cause leakage under striking.