20 Nm is not very tight at all, nor do oil filters need to be. Tighten it by hand to the point it grips the seal, and then give it a little bit more. Do not overtighten it.

Is this a spin on or a cartridge filter?

If a spin on then hand tighten only. Do not use any wrench.

If a cartridge filter then tighen very carefully and gently if you have to use a wrench. 20Nm is very little torque, (approximately 2kg at the end of a 1m bar static torque).

Do not overtighten since most modern cartridge filter housings are made of plastic.

Q.