Reminds me of a buddy of mine some years back. He had an '81 Lincoln Town Car he bought used and never changed the oil. Just kept topping it off every now and then. This went on for about three years. Turns out he doesn't know how to change the oil. I told him to bring it by my house and I'd show him how. He shows up with a case of oil, two filters, and two cans of GUNK engine flush. I tell him I'll change his oil, but in no way will I use the GUNK. I tell him his car will throw a rod in a week. I climb under the car and pull the drain plug. Nothing. I get a piece of wire and work it in the drain hole and am rewarded with something that closely resembles roofing tar. (Yes, the motor was hot when we did this). We let it drain, (for lack of a better word), all afternoon. Replaced drain plug, replaced oil filter, filled it with motor oil. I go inside to get a beer, he pours in the GUNK and fires up the motor. I come out with two beers, (one for him), and he tells me what he did. We drain oil and replace filter. This was on a Sunday afternoon. Friday afternoon, he calls me standed on the side of the road. I go to pick him up - Lincoln has thrown a rod.
