Genuine OEM BMW Crankshaft Bearing Shell, part number 11217849234. This bearing shell supports the crankshaft and reduces friction during engine rotation. It is a critical component within the engine block assembly. This specific shell is identified by the blue colour code, indicating its precise thickness for clearance adjustment. Genuine OEM bearings are essential for maintaining factory tolerances, ensuring proper oil film distribution and a vibration-free service life for the engine.