Genuine OEM BMW Crankshaft Guide Washer, part number 11211702144. This washer serves a critical role in guiding and supporting the crankshaft during engine operation. It helps maintain proper alignment and reduces friction within the engine assembly. The washer is made from high-strength materials to withstand the intense forces and temperatures inside the engine. Genuine OEM crankshaft guide washers are manufactured to precise tolerances, ensuring the integrity and longevity of the engine.