Genuine OEM Volkswagen Engine Piston, part number 03L107065AA001. This critical engine component moves within the cylinder, converting the pressure from combustion into mechanical force that drives the crankshaft. It is typically made from a durable aluminum alloy and includes piston rings to seal the combustion chamber. Weighing approximately 0.83 kg, using a genuine OEM piston ensures precise dimensions, correct weight for engine balance, and optimal material composition for durability and performance under extreme conditions.