The Mercury OptiMax is a line of V6 outboard engines, available with power outputs ranging from 115 to 175 horsepower. These engines, first introduced in 2000 and identifiable by serial numbers starting with OG960500, feature Direct Fuel Injection (DFI) technology and an oil injection system for enhanced performance and efficiency. Engineered for reliability and robust operation, the OptiMax series is designed to meet the demands of various marine applications, offering a blend of power and advanced fuel delivery. This comprehensive manual provides detailed service, repair, and maintenance information for the Mercury OptiMax outboard engines. It covers a wide array of topics including general information, specifications, routine maintenance procedures such as lubrication, tune-ups, and inspections, as well as troubleshooting guidance. With step-by-step instructions, detailed illustrations, and exploded views, this guide is an essential resource for both professional technicians and DIY users seeking to maintain and repair their Mercury OptiMax engines effectively.