Genuine OEM Audi Engine Valve Spring, part number 06E109623AH. This precision-engineered coiled spring plays a critical role in the engine's valvetrain, controlling the precise opening and closing of the engine valves. Made from high-grade spring steel, it is designed to withstand extreme temperatures and constant cycling. The spring weighs approximately 0.0345 kg. Using a genuine OEM valve spring ensures correct tension, fatigue resistance, and long-term engine reliability, which is crucial for maintaining optimal engine performance and preventing costly damage.