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1)DNS oil filter could filter out effectively the dirty things, such as metal abrasives,dust,smoke granules,etc.. Its internal central tube is designed precisely to reinforce the filtering structure strength with screw-type punching, and to avoid the deformation or suction because of the high pressure of the oil.

2)There is a bypass valve inside to ensure that the sufficient amount of oil is supplied to the engine under any condition. Bypass valve also called safety valve,which could enhance product reliability. When the user did not replace the oil filter, it could ensure the stability of oil supply to the engine without the blockage.

3)There is a check valve inside with the complex design of  reflux inhibition which can effectively prevent the dirty lubricating oil without filtration from flowing back into the engine and ensure that there is enough engine oil in the oil filter for the next starting to reduce wear when cold start.

4)With strict factory seal inspection, the failure rate of our product quality is far below the national requirements of the 3/1000.