2018 Mercury FourStroke 150 HP - 25 in. Shaft

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FourStroke 150 HP - 25 in. Shaft



Stronger. Lighter. More Durable.

Massive displacement and the lightest 150 hp four-stroke in its class

  • Performance, Durability, Efficiency: Making 150 horsepower is easy for this 3.0-liter, four-cylinder, single-overhead-cam engine. Its generous displacement lets it churn out power without breaking a sweat. You get exceptional durability and long-term peace of mind.
  • Compact and Versatile: It’s the lightest 150hp four-stroke outboard on the market. Smart design makes the 150hp Mercury FourStroke nearly 20 pounds lighter than its closest four-stroke competitor, and less than a battery weight heavier than a two-stroke. Potential uses for this engine are endless, including bay boats, boats with poling platforms and pontoons with swim platforms.
  • Propped to Perform: The Mercury Enertia® propeller is the perfect complement to the 150 FourStroke. Designed specifically for large four-stroke outboards with a revolutionary low-diameter/high-blade-area design and cast with the Mercury proprietary X7® propeller alloy, Enertia delivers phenomenal acceleration, top speed and durability.
  • Easy to Maintain: Rather do it yourself? The no-spill oil-change system, an easy-access fuel filter and a lifetime maintenance-free valve train make the Mercury 150 FourStroke the easiest-to-maintain 150hp four-stroke on the market. Scan a QR code under the cowl to link with step-by-step video demonstrations.
  • Perfect for Repower: The compact, lightweight design of the Mercury® 150hp FourStroke engine fits most transoms, including those with narrow engine wells and tight motor spacing. Rig it with mechanical or hydraulic steering, mechanical control and cable systems, and a full complement of analog or SmartCraft® gauges.
  • VesselView Mobile: Now you can have the power of SmartCraft on your mobile device (iOS or Android) with all the digital data your SmartCraft engine supports - plus new features such as Maintenance Reminders, Mapping, Performance Summary and Fault Code Diagnostic information. Connect with your engine and be in the know. (*VesselView Module required; available for purchase at Mercury Marine dealers, or from the VesselView Mobile app)
  • HP / kW: 150 / 110
  • Engine type: 8-valve single overhead cam (SOHC) Inline 4
  • Displacement (L): 3
  • Full throttle RPM: 5000-5800
  • Air induction: Performance-Tuned Scroll Intake Manifold
  • Fuel induction system: Computer Controlled Multi-Port Electronic Fuel Injection (EFI)
  • Alternator amp / Watt: 60 amp / 756 watt (Belt-Driven)
  • Recommended fuel: Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum
  • Recommended oil: Mercury FourStroke Oil 10W-30
  • Engine protection operator warning system: SmartCraft Engine Guardian
  • Compatible with SmartCraft digital technology: Yes
  • Starting: Electric (turn-key); Smart Start Electric
  • Controls: Mechanical throttle & shift
  • Steering: Big Tiller Compatible; Dual cable mechanical; Electro-Hydraulic Power Steering Optional on Duals; Hydraulic power steering
  • Shaft length: 25 in. / 635 mm
  • Gearcase ratio: 1.92:1
  • Dry weight *Lightest model available: 455 lb. / 206 kg
  • CARB star rating: 3
  • Bore and stroke: 4.0 x 3.6 in. / 102 x 92 mm
  • Ignition: SmartCraft ECM 70 Digital Inductive
  • Fuel system: Electronic Fuel Injection (EFI)
  • Cooling system: Water-cooled with thermostat
  • Gear shift: F-N-R
  • Gearcase options: Standard
  • Trim system: Power Tilt; Power Trim
  • Exhaust system: Through prop
  • Counter Rotation: Available
  • Color: Phantom Black
  • Lubrication system: Wet sump
  • Oil Capacity: 6.3 qts / 6.0l
  • Maximum Trim Range: 22° (-6° to 16°)
  • Maximum Tilt Range: 73° (-6° to 67°)
Dry Weight based on lightest model available. Android® is a registered trademark of Google®, Inc., Bluetooth® is a registered trademark of Bluetooth SIG, Inc., iOS® is a registered trademark of Cisco Systems®, Inc. (used under license by Apple®, Inc.), SmartCraft® and VesselView® are registered trademarks of Brunswick® Corporation.



Engine Type
8-valve single overhead cam (SOHC) Inline 4
Bore x Stroke
4.0 x 3.6 in. (102 x 92 mm)
3 L
Electric (turn-key); Smart Start Electric


Shaft Length
25 in. (635 mm)
455 lb. (206 kg)


Trim Method
Power Tilt; Power Trim
Shaft Rotation
Counter Rotation Available
Propshaft Horsepower
150 hp (110 kW)
Full Throttle Operating Range
5000-5800 rpm
Gear Ratio / Shift
1.92:1 / F-N-R
Fuel Induction
Fuel induction system: Computer Controlled Multi-Port Electronic Fuel Injection (EFI); Fuel system: Electronic Fuel Injection (EFI)
60 amp / 756 watt (Belt-Driven)
Water-cooled with thermostat
Big Tiller Compatible; Dual cable mechanical; Electro-Hydraulic Power Steering Optional on Duals; Hydraulic power steering
3 Year Corrosion; 3 Year Limited

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