I bought a low time engine IO 540 and Bravo airframe. Both had approximately 600 hours TT. The plane was about 20 years old. The previous owner lost his medical and could no longer fly. The plane had been flown monthly by a friend. It had been kept in a hanger with air conditioning and a humidifier. The owner was very wealthy and always gave the plane the best of care. I liked the airframe and panel but was concerned the engine might fail or be expensive to maintain I had the engine bore scoped, an oil analysis was done and the cylinder compression was taken.
All the tests were competed. The engine appeared fine. I had an extensive annual on the plane and bought it. I have put more than 150 hours on the engine. It has performed well and been a very good investment for me.