Genuine OEM BMW Crankshaft Bearing Shell, part number 11217512508. This shell provides a low-friction surface for the crankshaft, allowing it to rotate smoothly within the engine block. It is a crucial component for reducing wear and tear on the crankshaft and connecting rods. Made with precise tolerances for optimal oil film support. Genuine OEM bearing shells ensure the correct material composition and surface finish for reliable engine performance and longevity.