Massive oil leaks.

Good point. I had an engine builder in my area who was very good. He did lots of motors of all brands and types that all were sucessful. All of a sudden, myself and other guys had problems with his work. We found out that he was trying to teach his mentally handicapped son to do the work. He retired soon after the poop hit the fan. We are all Human, and stuff happens.

And how you handle that stuff that happens is the difference between good and bad business practices.