Genuine OEM BMW Crankshaft Main Bearing Shell, part number 11217627031. This bearing is a crucial component of the engine's rotating assembly, supporting the crankshaft. It is designed to reduce friction and wear between the crankshaft journals and the engine block. This specific part is a main bearing shell. Constructed from a high-quality metal alloy to withstand high loads and temperatures. Genuine OEM bearings are manufactured to precise tolerances, ensuring minimal vibration and maximum engine lifespan.