Why Do Worn Piston Rings Require An Engine Overhaul?

Piston rings are a part of your engine you probably don't spend much time thinking about it, and that's generally a very good thing. While these components are relatively inexpensive, they're located deep within your engine and require a substantial amount of time and effort to reach. Unfortunately, worn piston rings are often inevitable as any vehicle ages, and they can cause significant problems. What Do Your Piston Rings Do?