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Enhance your 2013 Mercedes-Benz S550 with our 4.6L V8 engine, specifically designed for W221 RWD models and boasting 138K miles. This engine (part number 845810) has been rigorously run-tested to ensure optimal performance and reliability. With its powerful design, it delivers the luxury and smooth driving experience that Mercedes-Benz is known for. Whether you're replacing a worn-out engine or upgrading for better performance, this tested engine is the ideal solution. Trust in the quality and engineering of a genuine Mercedes part to keep your S-Class performing at its best!