Many engines have the potential to go past TBO if they are babied: no flights under an hour, cruised at 60%, flown frequently, reduced power take-offs, meticulous maintenance, etc.
things break. planes are not cheap. trying to save money in aviation is usually a load of crap. if you think you are coming out ahead you are insane. if you are really deadset on being cheap in aviation. if there even is such a thing. go join a flying club. comparing renting an airplane to buying one you are not going to come out ahead on either. aviation is already a rich mans game. if you are thinking you will save a buck here and there at what cost will it be at? the airplane? a passenger? your life?!?!? suck it up and spend the money. if you dont you will pay later. can an engine go past tbo? sure! if you fly it like 12 hours a year and are doing it for fun. ive put athousand hours on a cherokee in a year and this airplane is a workhorse. airline pilots ask me why dont you take pride in your airplane and wash it? i tell them do you wash the md80 when you go to work? its meant to be FLOWN. i fly more than anybody at my airport. i have sank 10k in this airplane in a year to keep it up to par. if you think you are giong to save a buck you are completely nuts. you WILL spend money. this is aviation. trying to cut corners in this business someone will get hurt.