Mercury 300CXL 300HP SeaPro AMS Counter V8 25″ Outboard Motor

Mercury 300HP 300CXL SeaPro AMS Counter Power

Technology driven and built upon a 4.6L V8 engine family, the Mercury 300HP 300CXL SeaPro serves as a high-torque solution for US commercial boaters requiring a prop-rated propulsion unit with superior thermal stability. This 300HP four-stroke technology utilizes a counter-rotating gearcase and Advanced MidSection (AMS) to maximize mechanical efficiency and vibration dampening for heavy commercial vessels and offshore workboats. The 25-inch extra-long shaft design provides an optimized center of gravity, while the Digital Throttle and Shift (DTS) ensures immediate, reliable ignition under high-duty cycles.

Operational longevity of the 300CXL SeaPro model is secured through a specialized pressurized lubrication system featuring commercial-grade validation to maintain internal cleanliness under constant load. To facilitate easy after-storage starts, the unit employs a multi-port EFI system paired with an 85A high-output alternator for extensive onboard electronics, while the Mercury XK360 alloy science utilizes a multi-layer finish to mitigate oxidation. With a commercial-specific warranty and reinforced gearcase, this fuel-efficient outboard provides superior ownership value for professionals seeking maximum uptime and specialized multi-engine reach.

Key Features of Mercury 300CXL SeaPro

• 4.6L V8 32-Valve DOHC Engine Block
• 300.0HP Prop-Rated Output at 5400 RPM
• 25″ Extra Long Shaft / 600 lbs Dry Weight Chassis
• Counter-Rotating Multi-Port EFI System
• Digital Remote Steering with Power Trim
• Advanced MidSection (AMS) Cradle System
• 1.75:1 Gear Ratio / 7.0qt Oil Capacity