FourStroke 175 - 300hp
3.4L V6 and 4.6L V8

Reliability, flexibility, power and efficiency – all within your reach. Backed by decades of marine power innovation and product leadership, Mercury V8 and V6 FourStroke outboards deliver legendary performance and forward-thinking technology. FourStroke outboards are built for any body of water and a wide variety of boats.

Intuitive, Innovative Features
Adaptive Speed Control
Adaptive Speed Control

Adaptive Speed Control maintains a desired rpm regardless of changes in load or conditions without adjustments to the throttle lever position – a first for the outboard industry.

Smooth and Quiet
Smooth and Quiet

The V8 and V6 FourStroke engines are quieter and smoother than the leading competitor.

Easy to Maintain
Easy to Maintain

The exclusive Top Cowl Service Door simplifies routine maintenance, letting you check or add engine oil without removing the top cowl. An hour-based maintenance schedule decal is located under the cowl, providing a quick overview of routine maintenance.

Industry-Exclusive Battery Management Technology
Industry-Exclusive Battery Management Technology

When battery voltage is low, engines will automatically increase idle rpm to boost alternator output and charge batteries to the proper level, protecting batteries from draining while trolling and operating electronic devices.

Ample Charging Output
Ample Charging Output

FourStroke models feature a robust alternator that delivers 20 amps net of charging power at idle and 30 amps total at wide-open throttle.

FourStroke Performance Data
Quick Acceleration

The high-displacement, quad-cam design of the V8 and V6 FourStroke powerheads generates plenty of torque, especially at mid-range.

Superior Fuel Economy

Advanced Range Optimization improves cruise-speed fuel efficiency by automatically adjusting fuel delivery so seamlessly the operator won’t feel or hear it.

Light and Compact

Mercury V8 and V6 FourStroke outboards are the lightest in their respective class by at least 10 pounds and mount on 26-inch centers for broader fitment.

Acceleration (0-20 mph; SECONDS)
V6 200hp FourStroke 18% QUICKER
Competitor 200hp
V8 300hp FourStroke: 9% MORE TORQUE
Competitor 300hp
V6 200hp FourStroke: 20% MORE TORQUE
Competitor 200hp
Weight (lbs.)
V8 4.6L 300hp
Competitor 300hp
V6 3.4L 200hp
Competitor 200hp
FourStroke Advantage

Go Farther: Advanced Range Optimization by Mercury Marine uses closed-loop fuel control to precisely adjust the fuel mixture and deliver the best possible efficiency.

Keep It Steady: Adaptive Speed Control maintains engine speed (rpm) regardless of load or condition changes – such as rough water, tight turns, tow sports and lower speeds on plane – without having to frequently adjust throttle position, a first for the outboard industry.

Lighter by Design: Ounce by ounce, Mercury engineers cut pounds from the FourStroke outboards, ensuring each engine is the lightest in its respective class.

Smart Charging: Idle Charge battery-management prevents boaters from draining their batteries while operating multiple electronic devices. When battery voltage is reduced, the engine will automatically increase idle rpm to boost alternator output and recharge low batteries to the proper level.

Engine Specifications by Horsepower
SmartCraft. Boating with a Higher IQ.

SmartCraft® is a full suite of digital technologies, fully integrated and totally coordinated. Gauges, sensors, vessel systems, computer-controlled features – one total package, one high level of control. Make your boating experience easier, safer and a lot more enjoyable.  

Active Trim

Active Trim makes boating easier and more enjoyable by automatically trimming outboard engines. Active Trim simplifies boat operation while improving engine performance and decreasing fuel costs.
Active Trim is compatible with all current SmartCraft-capable Mercury outboards (40hp and above).

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VesselView Mobile

VesselView Mobile allows boaters to use a mobile device (smartphone or tablet) to connect with their Mercury outboard engine(s). The plug-and-play module connects via Bluetooth, providing quick, convenient access to your engine’s data.
VesselView Mobile is compatible with all SmartCraft-capable Mercury outboards (2004 and newer, 40hp and above).

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VesselView Link

VesselView Link integrates your existing multi-function display with your Mercury engine(s) to place information and control at your fingertips. Its user interface is easy to navigate, and it integrates chart-plotter, sonar, radar and more into one display.
VesselView Link is compatible with all SmartCraft-capable Mercury outboards (2004 and newer, 40hp and above).

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Big Tiller

Big Tiller offers optimal control for 175 - 300hp FourStroke outboards. It incorporates a convenient power trim switch, close-at-hand shift lever and an optional digital troll control that adjusts engine speed in 10-rpm increments.
Big Tiller is available on 150 - 300hp FourStroke outboards.

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Time for a new Power?

Replacing an old outboard can deliver improved performance, increased fuel economy and better boat handling for a more enjoyable boating experience. The entire family of FourStroke outboards is lightweight and compact, making those engines perfect for repower on older boats. Work smarter and easier with the latest technologies, improved fuel economy and greater reliability.

Explore Our Other Engine Families

Mercury V8 and V6 Engines deliver what boaters once thought was impossible: Everything.
Learn More About V6/V8 Technology.


4.6L V8 250-300HP VERADO


Smooth, quiet, vibration-free operation, coupled with standard power steering and Digital Throttle & Shift make for a level of comfort and a refined driving experience that are unrivaled in the industry.


4.6L V8 AND 3.4L V6 175-300HP PRO XS


The Pro XS has spent more than a decade blurring the line between consumer and high-performance outboards. It delivers unmatched speed, acceleration and reliability to bass, multispecies and sport boats.


4.6L V8 AND 3.4L V6 SEAPRO


Purpose built to help you do your job. SeaPro has the displacement, power, efficiency and durability you need to get your work done and get home. Every single day, year in, year out.

Limited Warranty

World-class marine products backed by world-class warranties! We stand behind everything we build, and we go the extra mile to ensure your Mercury experience is the best it can be – on the water and off.

Mercury Product Protection

Mercury Product Protection is an extended service contract for your Mercury engine and MotorGuide trolling motor that covers certain expenses caused by defects in materials and workmanship after the Mercury Limited Warranty expires.


An exclusive Top Cowl Service Door on Mercury V8 and V6 outboards simplifies routine maintenance by letting you check or add engine oil without removing the top cowl. The Top Cowl Service Door also houses the latch release and a carrying handle.

A graphic, hour-based maintenance schedule decal is conveniently located under the cowl and provides a quick overview of routine maintenance intervals and a QR code to access additional information.

Easy access: All maintenance points are color-coded and accessible by removing only the top cowl.


Take a deeper dive into what makes Mercury FourStroke outboards stand apart with detailed information on each motor and the features that make them unique.

The Best Products Have the Best Dealers

When you make the best marine products in the world, you want the best dealers behind them. That’s why we ensure that Mercury dealers are the best equipped to sell and service our products. Your Mercury Authorized Dealer is the best place to see and purchase Mercury engines as well as genuine Mercury Precision Parts and Accessories. And with thousands of dealers, you can rest assured we’re always close by and ready to help you go boldly.