Oil control rings are essential components of an engine's piston assembly. They help regulate the amount of oil that lubricates the cylinder walls, preventing excessive oil from entering the combustion chamber. This ensures optimal engine performance and reduces harmful emissions. These rings are typically made of durable materials to withstand high temperatures and pressures. Proper functioning of the oil control rings is crucial for maintaining engine efficiency and longevity, as they help minimize oil consumption and prevent oil fouling of the spark plugs, which can lead to engine misfires.