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SeaPro - more power for the job

Ideal for commercial fishing, commercial workboats and law-enforcement boats. Available with joystick piloting, electro-hydraulic power steering and Mercury’s Advanced MidSection (AMS). The Advanced MidSection virtually eliminates vibration being transmitted to the boat, while joystick piloting provides maximum control and manoeuverability.

The new Mercury SeaPro V-8 and V-6 outboard models bring more of everything to the job—more displacement, more power, more efficiency and more durability. The impressive muscle of our new 4.6-litre V-8 and 3.4-litre V-6 powerheads is specifically designed for commercial duty and delivers our best-ever fuel economy. The combination of ample torque and low weight makes these engines ideal for heavily-loaded boats. Guaranteed to do its job, so you can do yours.

Mercury 300 HP AMS SeaPro Specifications


HP / kW

300 / 224


Advanced MidSection (AMS)

Engine type

V8 [64 degree] with Dual Overhead Cam [DOHC] and 32-valves

Displacement (CID/CC)

279 CID

Displacement (L)


Full throttle RPM


Air induction

Performance-Tuned Long-Runner Intake Manifold

Fuel induction system

Electronic Fuel Injection (EFI) Computer Controlled with Advanced Range Optimization

Alternator amp / Watt

115-amp (1449 Watt) with Idle Charge

Recommended fuel

Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum

Recommended oil

NMMA Certified FCW SAE 25W-40 (Optional 10W-30 for Cold Conditions)

Engine protection operator warning system

SmartCraft Engine Guardian

Compatible with SmartCraft digital technology



Electric Start with SmartStart Protection


Digital Throttle & Shift (DTS)


Joystick Piloting for Outboards

Shaft length

20" / 508 mm

25" / 635 mm

30" / 762 mm

Gearcase ratio


Dry weight *Lightest model available

600 lbs / 272 kgs

CARB star rating


Bore and stroke

3.6 in x 3.4 in / 92 mm x 86 mm


SmartCraft PCM 112 Digital Inductive

Cooling system

Water-cooled with thermostat

Gear shift


Gearcase options


Trim system

Power trim and tilt

Exhaust system

Through prop

Counter Rotation



Phantom Black

Oil Capacity

7.0 Quarts / 6.6 Litres

Maximum Trim Range

20° (-6° to 14°)

Maximum Tilt Range

73° (-6° to 67°)

Engine 1

Engine Make Mercury SeaPro
Displacement 4.6
Horse Power 300
Fuel Type Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum
Drive Type Outboard
Stroke 4-Stroke


200 - 300 HP SeaPro Brochure