Genuine OEM Volkswagen Spark Plug, part number 101000036AA. This essential component is responsible for igniting the compressed fuel-air mixture within the engine's combustion chambers, initiating the power stroke. It is precisely engineered to deliver a consistent, powerful spark under varying engine conditions. Installed in the cylinder head, it plays a direct role in engine performance, fuel efficiency, and emissions. Choosing a genuine OEM spark plug ensures the correct heat range, electrode gap, and material composition for optimal engine function, preventing misfires and premature wear.