Genuine OEM BMW Crankshaft Main Bearing, part number 11218606300. This bearing shell is a critical component that supports the crankshaft within the engine block, allowing for smooth rotation while minimizing friction and wear. It is designed with precise tolerances to ensure optimal lubrication and performance. Genuine OEM bearings are manufactured to exact specifications, guaranteeing the correct material properties and surface finish for a long, vibration-free service life.