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I think the motor or transmission will tell you when it's time to rebuild. I have owned a Honda Civic and and Acura Integra that both had well over 200k on them when they were traded in, and they both still ran fine. They were long haul miles, and I think that is part of the secret, along with good maintenance, and frequent oil changes. Your engine will probably just get more and more 'tired' as time goes on-- it will lose a little snap to it's accelaration, or gear noise will increase, somthing like that. A complete rebuild could turn out to not be cost effective, however. You will just have to asses how much the rebuild is going to cost and measure it against getting something much newer.