This service manual covers Mercury OptiMax DFI outboard motors, specifically the 135 and 150 horsepower models, beginning with the 2000 model year. These engines are renowned for their direct fuel injection technology, offering enhanced performance and efficiency. Designed for a wide range of marine applications, the OptiMax DFI series embodies Mercury's commitment to engineering excellence and reliable power on the water.

This comprehensive manual provides detailed information essential for the maintenance, repair, and troubleshooting of your Mercury OptiMax DFI outboard. It includes step-by-step procedures, technical specifications, diagnostic guidance, and safety precautions. Owners, technicians, and mechanics will find this resource invaluable for ensuring the optimal performance and longevity of their engine, covering all aspects from routine servicing to in-depth repairs.