2026 Mercury Marine SeaPro 300HP 25 in

2026 Mercury Marine SeaPro 300HP 25 in

5.7L V10, 4.6L V8 and 3.4L V6

Every day, even in the toughest conditions, SeaPro high-horsepower outboards are built to tackle the biggest jobs. They feature heavy-duty components designed to work as hard as you do, with unmatched corrosion resistance to go wherever the task takes you.

Exceptionally Smooth & Quiet

Precision-tuned intake and exhaust, combined with fuel-injector covers, minimize noise for more comfortable all-day operating. V8 and V6 models are 15-30% quieter than a leading four-stroke competitor, while the V10 model is 28% quieter at cruise than a leading competitor.

Lightweight & Compact

Each SeaPro Conventional MidSection (CMS) 200-300hp model is the lightest engine in its class and is built to handle the demands of commercial applications.

High Displacement

V10 and V8 SeaPro outboards boast class-leading displacement, while the 200hp SeaPro outboard features a brawny 3.4L V6 powerhead with plenty of muscle to get the job done.

SeaPro Advantage

Efficient All-Around Performance

A host of efficiency-enhancing features such as Advanced Range Optimization (ARO), a closed-loop fuel system and a hydrodynamic gearcase optimize fuel economy so you can get more done on every tank.

Compact Flexibility

V10, V8 and V6 SeaPro outboards mount on 26-inch centers, making them ideal for a broad range of multi-engine applications and simple, seamless repower rigging.

87-Octane

SeaPro outboards are calibrated to deliver full performance on 87-octane fuel, while a boat-mounted water-separating fuel filter kit helps prevent fuel-related issues.

High-Output Alternators

To help support a heavy load of onboard accessories, SeaPro outboards feature powerful alternators, including a 150-amp alternator on the 350hp engine.

SmartCraft® The Power to Do More  

Mercury SmartCraft® digital technologies refine the entire boating experience to ensure every day on the water reaches its full potential. From intelligent gauges and displays to advanced systems that make boat control easy, SmartCraft gives you the power to do more with your time on the water. 

SmartCraft compatibility is available for Mercury engines 2004 and newer, 40hp and above; 2022 and newer, 25hp and above. Features vary based on controls and engine models.

Gauges

SmartCraft digital gauges are a convenient solution for staying in the know. They offer at-a-glance access to precise engine data and select SmartCraft controls on a compact digital interface.

Controls

Enjoy instantly responsive control and precise handling with Mercury digital control systems. Whether driving or docking, every task is made easier so you can take the helm with confidence. 

Displays

With SmartCraft, you can integrate your engine with a compatible onboard display, gaining instant access to performance data and SmartCraft controls on the screen you use most.

Connectivity

The Mercury Marine app is the ultimate boating companion. It transforms your mobile device into a hub for monitoring data, connecting with a dealer and viewing helpful content.

Warranty & Maintenance

Warranty Coverage

Mercury makes world-class marine products backed by world-class warranties.

Maintenance

At Mercury, we make maintenance easy. Learn more about how to keep your Mercury products performing at their peak.

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