Rebuilt engine basically means the engine was taken apart, cleaned, and bad parts were changed for new or used ones. Now, here’s the thing. Rebuilt engines are fine when done properly, but they depend heavily on who does the rebuilding. Some rebuilders are super meticulous — they’ll check every bolt, polish every surface, and make sure it runs like new. Others… well, let’s just say so... https://beelinesautomotive.com/rebuilt-vs-remanufactured-engines-which-one-should-you-choose/