This manual covers the Mercury Mariner Optimax, a first-generation outboard motor produced between 2000 and 2005. Featuring a Direct Fuel Injection (DFI) 2-stroke V6 engine with approximately 1.5 liters of displacement and 135 horsepower, this model is engineered for reliable performance. Its advanced CDI ignition system and water-cooled design contribute to its efficiency and durability, making it suitable for a variety of marine applications. The through-propeller hub exhaust system is a notable design element. This comprehensive Factory Service Repair Manual, written in English, provides essential information for the maintenance and repair of your Mercury Mariner Optimax. It details crucial procedures, technical specifications, and troubleshooting guidance. Whether you are an owner performing routine upkeep or a technician undertaking complex repairs, this manual will serve as an indispensable resource to ensure your engine operates at peak performance and longevity. It covers aspects such as recommended fuel types and lubricants, essential for proper care.