A: 1. Judging from the appearance details: the appearance of a good oil filter must look good;
2. Look at the filter rubber ring for toughness and softness, good oil filter , the material of his rubber ring will be very thick, and the hand will also have a soft feeling to ensure the sealing of the mouth around the mouth;
3. See if there is a non-return valve. inside
4. Insert your finger into the inner wall of the filter to judge whether it is fixed. If the filter is good, the filter element will be firmly fixed inside the filter. It will not shift when it is under the pressure of the oil and the bumps of the vehicle. Ensure that the oil is filtered from the filter paper.