Genuine OEM Audi Longlife Spark Plug, part number 101905622A. This critical component is responsible for igniting the compressed air-fuel mixture within the engine's combustion chambers, initiating the power stroke. It screws into the cylinder head, with its tip extending into the combustion area. Weighing approximately 0.048 kg, this spark plug is designed for extended service intervals, providing consistent and powerful ignition. Choosing a genuine OEM spark plug ensures the correct heat range, electrode gap, and material composition for optimal engine performance, fuel efficiency, and longevity, preventing misfires and premature wear.