What can the build up of oil residue do to pistons and piston rings?

The buildup of oil residue on pistons and piston rings can lead to several issues, including reduced engine efficiency and increased wear. This residue can create a layer of sludge that hampers the pistons' movement, potentially causing them to stick and resulting in poor compression. Additionally, it can lead to increased friction and overheating, ultimately shortening the lifespan of the engine components. Regular maintenance and oil changes can help prevent these problems.