Genuine OEM Audi Engine Radiator, part number 4KE121251B. This primary heat exchanger is essential for dissipating excess heat from the engine coolant, preventing overheating and ensuring the engine operates within its optimal temperature range. Weighing 5.184 kg, it features a robust core and precise fin design for maximum thermal efficiency. Using a genuine OEM radiator guarantees exact fitment, proper cooling capacity, and durable construction, critical for engine longevity and reliable performance.