Mercury SeaPro 500hp V12 – the most powerful 4-stroke outboard for commercial use

The Mercury SeaPro 500hp V12 stands at the pinnacle of Mercury’s outboard lineup, built to conquer the most demanding commercial marine challenges. Its 7.6-liter V12 powerhead – the largest displacement of any outboard – delivers a mountain of torque at lower RPM, allowing even the heaviest vessels to plane quickly and cruise with ease at every speed. Mercury’s revolutionary two-speed automatic transmission optimizes power delivery: First gear provides explosive thrust to get heavy boats moving instantly, then it silently shifts to second gear for efficient, steady cruising with no jarring shift clunks. Paired with a steerable gearcase that pivots underwater (while the engine above remains fixed), the SeaPro 500hp offers precise maneuverability in tight quarters and effortless handling in open water – performance once unimaginable in an outboard of this size.

Every element of the 500hp SeaPro is engineered for endurance, efficiency, and ease of use. The dual contra-rotating propellers bite hard into the water, propelling heavy loads swiftly and maintaining control even at low speeds. Mercury’s robust Advanced MidSection (AMS) mounting system and refined engine tuning dramatically reduce vibration and noise, establishing a new benchmark for smooth and quiet operation in a commercial outboard. The V12 SeaPro is calibrated to run on regular 87-octane fuel and features Advanced Range Optimization (ARO) technology that automatically adjusts fuel flow for optimal economy during cruise, helping to reduce operating costs. Maintenance has been thoughtfully simplified: a top-cowl service door allows quick oil checks and top-offs without removing the engine cowling, and extended oil-change intervals (every 200 hours) mean less downtime and more time working on the water.

Whether deployed on a large workboat, a passenger ferry, or an offshore patrol vessel, the Mercury SeaPro 500hp V12 delivers uncompromising power and reliability. Its heavy-duty components and corrosion-resistant construction are purpose-built to thrive in commercial service, so you can stay on the water longer and get the job done even in the harshest conditions.

• Ideal use cases: Single-engine installation on very large commercial RIBs and workboats (approximately 9+ meters in length), or multi-engine setups (twin, triple, quad) on offshore patrol vessels and commercial fishing boats that demand extreme total horsepower.
• Recommended for: Commercial fleet operators, government and law enforcement agencies, and offshore service vessels that require the absolute pinnacle of outboard power and durability. The SeaPro 500hp V12 is best suited for scenarios where maximum thrust for heavy loads and continuous operation are paramount – from large cargo barges and offshore supply boats to patrol and rescue craft where there is no room for compromise.