Mercury Optimax 175 HP Pro XS – Some call it a two-stroke. Some call it direct injection. Others simply call it the best-performing outboard on the water. From the rocket hole-shots to the unmatched top end, OptiMax sets the standard for power, acceleration, and fuel economy.

HP / kW
  • 175 / 129
Engine type
  • V-6
Displacement (L)
  • 2.5
Full throttle RPM
  • 5250-5750
Alternator amp / Watt
  • 60 amp / 756 watt
Recommended fuel
  • Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum
Recommended oil
  • Mercury OptiMax/DFI Outboard Oil
Engine protection operator warning system
  • Low oil level
  • Over-rev
  • Overheat
  • SmartCraft Engine Guardian
Compatible with SmartCraft digital technology
  • Yes
Starting
  • Electric (turn-key)
Steering
  • Big Tiller Compatible
  • Remote
Shaft length
  • 20″ / 508 mm
  • 25″ / 635 mm
Gearcase ratio
  • 1.87:1
Dry weight *Lightest model available
  • 431 lbs / 195 kg
Emissions Star Rating
  • 3
Bore and stroke
  • 3.50 x 2.65″ / 89 x 67 mm
Ignition
  • PCM Digital Inductive
Fuel system
  • 2-stage Direct Fuel Injection (DFI)
Cooling system
  • Water-cooled with thermostat & pressure-controlled
Gear shift
  • F-N-R
Gearcase options
  • Standard
Trim system
  • Power Trim
Exhaust system
  • Through prop
Shallow water trim range (degrees)
  • 20
Counter rotation
  • Available
Color
  • Phantom Black