Genuine OEM Audi Engine Auxiliary Radiator, part number 4M8121002. This secondary cooling component is designed to provide additional heat dissipation capacity for the engine's cooling system, helping to maintain optimal operating temperatures under various conditions. It is typically positioned in the front of the vehicle, often below the main radiator. Weighing 1.618 kg and measuring 0.83 meters in length, this radiator is built to factory specifications. Choosing a genuine OEM auxiliary radiator ensures correct fluid flow, efficient heat exchange, and durable construction that integrates seamlessly with the existing cooling system, preventing overheating and extending engine life.