I think we have all been in that situation at some point. Several years ago a college buddy of mine bought a really nice 8430 at an auction in another part of the state. It had 1500 hrs on it, had been shed kept, and looked brand new, except that the tires were about shot from running on the highway. My buddy took it home, and put 8 new radials on it. When he put it in the field that spring breaking up land, she didn't last but a couple of hours before the crankshaft broke, and the engine self destructed. My buddy's wife said he sat there in the cab and cried, because he knew that a new engine would cost about as much the tractor was worth. What we later found out from one of the previous owner's neighbors was that It seems that the guy who kept the tractor in an enclosed shed, and waxed it to the max, had not bothered to change the oil in it since it was new in 1978. No wonder everthing at that sale went cheap, all the locals probably knew the guy was a half a$$, and were not fooled by all the shiny green paint like us out of towners. I bought a 4230 at that same auction, but fortunately the MORON had already blown the engine up in the tractor I got while pulling it, so it had only been 500 hrs since the engine was rebuilt. (also the last time the oil was changed) I have put 2500 hrs on it so far with no problems. It just goes to show that when you buy used equipment, you never can be 100% sure of what you are getting even if it looks well maintained.