Genuine OEM Volkswagen Engine Oil Jet, part number 05E103157. This precision component is designed to spray a fine stream of oil onto the underside of the pistons, providing essential cooling and lubrication. This function is critical for managing piston temperatures and preventing premature wear, especially in high-performance or turbocharged engines. It is located within the engine block, strategically aimed at the piston crowns. Weighing 0.018 kg, this jet is manufactured from durable metal. Choosing a genuine OEM oil jet ensures the correct spray pattern, flow rate, and pressure, which are vital for effective piston cooling and overall engine reliability.