This manual covers the Mercury MerCruiser GM V8 496 CID 8.1L Marine Engine, manufactured between 1998 and 2006. This robust V8 engine is designed for marine applications, offering substantial displacement for reliable performance on the water. Its engineering is focused on durability and power, making it a capable choice for various boating needs. This comprehensive English-language manual serves as a vital resource for owners and technicians. It details general information, routine maintenance procedures, engine specifications, and advanced troubleshooting. Coverage extends to the fuel system, lubrication, cooling system, electrical system, and transmission, providing the necessary guidance to maintain and repair the engine effectively.