🏷️ Basic Information Identification Make: Mercury Model: Mariner Outboard Engine Variant: 250 EFI 3.0 Marathon Year: Not Specified Generation: Not Specified 📋 Manual Details Content Manual Type: Factory Service Repair Manual Language: English Format: Downloadable PDF Description: Contains detailed illustrations and step-by-step repair procedures. ⚙️ Engine Specifications General Engine Type: V6 Outboard Aspiration: Fuel Injected (EFI) Capacity Displacement: 3.0 Liters Performance Horsepower: 250 HP Cooling Cooling System: Water-Cooled 🔧 Transmission Gearcase Type: Outboard Gearcase Drive System: Forward, Neutral, Reverse 📐 Dimensions Shaft Length Shaft Length: Not Specified (Varies by model configuration) 🔧 Maintenance Lubrication Gearcase Oil Capacity: Not Specified (Refer to manual for specific quantity) Recommended Gear Oil: Mercury High Performance Gearcase Lubricant (Refer to manual for specific viscosity) Intervals Spark Plug Replacement Interval: Refer to manual Water Pump Impeller Replacement Interval: Refer to manual 📄 Fuel System Induction Fuel Delivery: Electronic Fuel Injection (EFI) 📄 Electrical System Ignition Ignition System: Electronic Ignition 📄 Cooling System Components Thermostat Type: Not Specified (Refer to manual)