Genuine OEM Audi Engine Piston Complete, part number 06A107065J. This vital engine component is responsible for converting the pressure from combustion into linear motion, which then drives the crankshaft. It operates within the engine cylinder, forming a sealed chamber with the cylinder wall and cylinder head. Weighing approximately 0.46 kg and measuring 0.082m in diameter, this piston is engineered for precise fitment and optimal performance. Choosing a genuine OEM piston ensures factory-specified tolerances, material strength, and ring sealing, which are critical for engine compression, power output, and long-term reliability.