The MerCruiser #1 OEM Manual Stern Drive and Marine Engines set of 2 #90-68648-286 is a comprehensive manual designed specifically for Mercruiser stern drives and marine engines. This set of manuals provides essential information for operating and maintaining these specific models, ensuring optimal performance and longevity. Whether you are a boat owner, mechanic, or enthusiast, this manual set is a valuable resource for understanding and preserving the functionality of your Mercruiser engines.