Genuine OEM BMW Crankshaft Bearing Shell, part number 11218471804. This component is a critical part of the engine's internal rotating assembly, providing a low-friction surface for the crankshaft to rotate within the engine block. It is engineered to withstand high loads and temperatures, ensuring smooth engine operation and preventing premature wear. The exact tolerances and material composition of genuine OEM bearing shells are vital for maintaining engine integrity and performance over its lifespan.