What are the reasons for oil leakage after replacing the oil filter?

[VonMargaret]

The reasons for oil leakage after replacing the oil filter are as follows: Not tightened properly: The repair manual usually specifies the tightening torque. Generally, mechanics rely on experience to tighten it. If it is not tightened to the specified torque range, it may cause oil leakage. Poor quality sealing ring: If the sealing ring is of poor quality, the sealing effect will be poor, leading to leaks. Deformation at the sealing port: Improper force during tightening can cause deformation at the sealing port, resulting in oil leakage. This situation is rare, but once it occurs, it can be troublesome and may persist throughout the vehicle's lifespan. Unstable oil filter: If the oil filter is not secured properly, it can cause leakage. Check if the oil filter is not installed correctly.