Genuine OEM Audi Coil Spring, part number 4F0511115BD. This vital suspension component is designed to support the vehicle's weight and absorb impacts from road irregularities, contributing to ride comfort and stable handling. It is positioned as part of the rear suspension assembly. This heavy-duty spring weighs approximately 3.401 kg and measures about 0.31 meters in length. Choosing a genuine OEM coil spring ensures it meets factory specifications for spring rate, height, and material fatigue resistance, which are crucial for maintaining the vehicle's intended ride quality and safety.