This service manual covers the Mercury Mariner 150 HP EFI outboard motor manufactured between 1992 and 2000. This V6, naturally aspirated engine features Electronic Fuel Injection (EFI) and a displacement of 153.4 cubic inches (2.5 Liters), delivering 150 horsepower. Engineered for reliability and performance, the Mariner 150 HP EFI is designed for a variety of marine applications, offering robust power and efficient operation. Its water-cooled system, CDI ignition, and power trim and tilt capabilities contribute to its advanced design and user-friendly operation. This comprehensive service manual provides detailed information for the repair and overhaul of your Mercury Mariner 150 HP EFI outboard. It covers essential maintenance procedures, including lubrication, scheduled replacements for spark plugs, fuel filters, and water pump impellers, along with technical specifications for engine configuration, performance, and electrical systems. This guide is an indispensable resource for owners, mechanics, and technicians, offering the necessary knowledge to ensure the optimal performance, longevity, and safe operation of the engine.