Genuine OEM Audi Engine Valve Spring, part number 079109623D. This precision-engineered spring is a crucial component within the engine's valvetrain, responsible for closing the engine valves. It operates under high stress to maintain proper valve timing and sealing. Constructed from durable spring steel, it weighs approximately 0.035 kg. Using a genuine OEM valve spring ensures the correct spring rate and fatigue resistance, critical for maintaining engine performance, reliability, and preventing catastrophic valve train failure.