okay so the oil pump would be more likely to be a self contained leak, blow into the crank case. i filled up three times with various used oils to limp it and the system had no problem self priming/ pumping its guts out.If the oil pump fails. You lose pressure to leak out the sides. The motor also goes bad. Usually.
pulled over and had my dad deliver some "left over" oil, car cooled off in the hour n a half with the -18c weather, that and doing the last leg car never seen operating temps. but leak it did, stopped to top up three times in the 11km trek last 3k were dry going as slow as i could go.
probably took 5years off the motor right there but if I can get away with a front main I'll risk it.