This manual covers Mercury Mercruiser 5.7L MPI Engines, part of the Multi-Port Injection era. These V8, 4-stroke engines are naturally aspirated and feature a 5.7-liter displacement with electronic ignition and a multi-port fuel injection system. Designed for marine propulsion, they are typically paired with sterndrive or inboard transmissions. While specific production years are not detailed, the manual addresses models from the late 1990s onwards. These engines are known for their robust engineering and reliable performance in demanding marine environments. This comprehensive service repair manual provides detailed guidance for engine repair, maintenance, troubleshooting, diagnostics, and overhaul. It is intended for boat owners, marine mechanics, and service technicians, offering essential information to ensure the optimal performance and longevity of the Mercury Mercruiser 5.7L MPI engines. The manual includes procedures for routine maintenance such as oil changes, spark plug servicing, and drive belt inspection, along with technical specifications and safety guidelines.