Genuine OEM Audi Engine Piston, part number 06D107066S. This critical engine component moves within the cylinder, converting the pressure from combustion into mechanical force to drive the crankshaft. It is a precision-engineered moving part within the engine block. Weighing approximately 0.503 kg, it is typically made from a high-strength aluminum alloy. Using a genuine OEM piston ensures correct dimensions, weight balance, and material properties for optimal engine performance and longevity.