Genuine OEM Audi Coil Spring, part number 8J0511115C. This spring is a critical component of the suspension system, responsible for supporting the weight of the vehicle and absorbing road impacts to maintain ride comfort and handling stability. It is positioned in the rear suspension assembly between the upper and lower spring seats. Genuine OEM springs are manufactured to precise metallurgical specifications and load-bearing tolerances to ensure consistent performance and safety over the life of the suspension.