This manual covers the Mercury Mariner Optimax outboard engine, featuring a 200 horsepower Direct Fuel Injection (DFI) Optimax engine. Engineered for reliable performance, this water-cooled engine utilizes electronic ignition and a power trim and tilt system. Its Direct Fuel Injection technology ensures efficient operation, making it a robust choice for various marine applications. This Factory Service Repair Manual provides comprehensive guidance for maintaining and repairing your Mercury Mariner Optimax engine. It details essential procedures, technical specifications, and troubleshooting steps necessary for optimal performance and longevity. The manual is designed to assist owners, mechanics, and technicians in understanding and servicing the engine, ensuring it operates at peak efficiency.