In my case, I really do have a good reason for turning a farsighted eye toward engine overhaul. Though my old Continental is closing in on its time between overhaul (TBO) number, it also received a substantial lower-end overhaul just a few hundred hours ago in its logs. Crankshaft, cases, bearings — all but its cylinders — were inspected and either replaced or refurbished. So I rationalize that with a good top overhaul, I can reasonably go well beyond TBO with a clear conscience. And so far, I've been real lucky with the way it's performed.