The Mercury Mariner DFI Optimax, produced between 2000 and 2005, represents a robust V6 outboard engine designed for reliable performance. Featuring a 2.5-liter, 2-stroke direct fuel injection system, this water-cooled engine delivers 150 horsepower. Its engineering emphasizes efficiency and power, making it suitable for a variety of marine applications. The Mariner DFI Optimax is built with quality and durability in mind, aiming to provide a dependable boating experience. This Factory Service Repair Manual provides comprehensive guidance for the Mercury Mariner DFI Optimax. It covers essential maintenance procedures, detailed troubleshooting steps, and critical technical specifications, including information on lubrication, ignition, fuel systems, and electrical components. This manual is an indispensable resource for owners, mechanics, and technicians seeking to maintain, service, and repair their Mercury Mariner DFI Optimax engine, ensuring its optimal performance and longevity.