Confused about differing torque values

It's just as well you don't use a torque wrench if you don't replace the crush washer. (I don't understand why you wouldn't though). The torque is calculated with the assumption you will. The higher torque is to crush the washer. Which is sacrificial to the load applied.
Only just seen your reply.

Part of the reason I haven't torqued the drain plugs is because I haven't always had the right fitting to connect to the wrench. But generally I do prefer to torque things if I have the right value.

But... After many many years of zero issues (with the oil drain plug) doing as I've described above, I haven't yet seen a reason to change my ways. That's zero issues, in case you missed it.

I don't always have a new crush washer to hand. But that too would seem to be overkill (again, I'm speaking specifically about the oil drain plug) based on my experience - which is, to my horror, approaching 35yrs.

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