Genuine OEM Audi Piston Rings, part number 06E198151S. These rings are essential components of the piston assembly, responsible for sealing the combustion chamber to maintain compression and controlling the flow of oil to prevent excessive consumption. They are fitted into grooves on the piston. Piston rings are critical for engine performance and longevity, requiring precise manufacturing tolerances to ensure proper sealing and heat transfer. Genuine OEM parts guarantee the exact fit, material composition, and performance characteristics designed by Audi engineers for optimal engine operation.