Hi Randy, when can you tell when your engine is worn out? Do they lose rpm's? If you hook your motor up to a scale, can you check pull against other engine? Will they start using more fuel at the same rpm's? Will they go lean and stay lean? I guess they could get air leaks around bearing gaskets, lose compression. I have some engine that are old and seem to run about the same as the rest. The castor oil still has a nice oil look, not burned or discolored. Using the same prop, fuel, tank and set at same rpm's, really close to the same pull on the fish scale. I believe I don't need her to be re-ringed. The engine I'm speaking about is my enya 60, 7032. I believe she is over twenty years old, I have a brand new enya 60, 7032 that I'm comparing her against. She's not as pretty looking as my new one but as long as she is okay, don't want to replace her. Just another dump question, I wanted to send her to Frank to be checked out but Frank is a very busy person. I love all the great work he's done for me. All my Merco just purr his name, after Franks rework on them, one flip and they just talk big time. Have a great day, Gary