Originally Posted By: Onmo'Eegusee
I would suspect vandalism. Looks like a punch hole to me.
same here. I've seen, and actually had, a pin hole in an oil filter from a rock or other debris hitting it, but that looks too intentional to be coincidence.
By any chance, did the OP manage to see where the hole was facing before removing the filter? If it was pointed down, then no doubt somebody got under and punched it with something.
nevermind, I see you already figured it was pointing up.