Usually don't replace those as you won't be putting enough pressure to do any real crushing. If they crack or start leaking then replace. I have not replaced mine yet and its had around 8 oil changes. Just be mindful of the torque spec..which is only somewhere between 18-25Nm or at the most 18Ft lbs or 221in-lbs. Seems high..might double check your specs. People tend to over tighten a drain plug and end up stripping it out. Don't need that. Do use a little anti-seize or some Teflon pipe dope on it..not the tape.