Genuine OEM Audi Oil Filter Housing Seal, part number 066115111A. This essential O-ring is designed to create a tight, leak-proof seal within the oil filter housing assembly, preventing oil seepage and ensuring proper engine lubrication. Its precise dimensions and material composition are crucial for maintaining oil pressure and cleanliness. Using a genuine OEM seal guarantees the correct material properties and resistance to engine oil and temperature fluctuations, preventing costly leaks.