The Genuine Mercedes Engine Crankshaft Thrust Washer - 6420333562 is a small, circular metal component designed to fit onto the crankshaft of a Mercedes engine. Its purpose is to reduce friction and wear on the crankshaft by providing a smooth surface for it to rotate against. This specific thrust washer is designed for use with the 6420333562 engine model. It is a genuine Mercedes product, meaning it is made by the original manufacturer and meets the high quality standards set by the company. This thrust washer is an essential component for maintaining the proper functioning of the engine and ensuring its longevity.