Genuine OEM BMW engine crankshaft seal, part number 11147797490. This seal is engineered to prevent oil leakage from the engine block at the crankshaft interface. It is constructed from high-grade synthetic materials designed to withstand extreme rotational speeds and thermal cycling. Genuine OEM seals are manufactured to precise tolerances to ensure a leak-free fit, which is essential for maintaining engine oil pressure and preventing contamination of surrounding components. Using the correct OEM seal is critical for long-term reliability and preventing costly oil leaks.