The correct uses of oil filter wrench are as following:
1)Select the appropriate size wrench according to the nature of work.
2)When using an adjustable spanner, apply force to the fixed side. Never use force toward the movable side.
3)If the wrench opening is worn out or slipping during use, do not continue to use it to avoid scratching your hands.
4)Do not use the spanner as a tap.
5)Do not add a pipe to the handle end to increase the torque of the wrench.