I've been looking around on various used-car sites and have noticed that a relatively high number of the RX-8s I've been seeing have new/replaced engines (with extremely low miles). My questions is, should this be something to be concerned about, or something that should make me even more interested in those cars?

Thanks,
Mosfet

 

A car with a new engine is usually a good thing. Read the thread titled " New owners start here" you will find the info you need.