300hp Mercury Pro XS V8 4.6L


ANZP_V6_V8_Compare Chart 300hp

Pro XS Advantage
Ultimate Performance: No outboard gets from zero to wide-open quicker than a Mercury Pro XS with 4.6L V8 and 3.4L V6 muscle. This is performance that will rocket your rig out of the hole and to the next hot spot in an instant.

Tournament-Winning Torque: More displacement delivers more torque and Transient Spark technology optimises spark timing to boost that torque during hole shot.

Squeezing Speed from Fuel: Mercury V8 and V6 Pro XS models transform every drop of fuel into performance to deliver excellent economy at cruising speed and wide-open throttle.

Smart Charging: A powerful alternator provides net charging output of 20 amps at idle and 85 amps at wide open throttle. Idle Charge battery-management technology automatically increases idle rpm to boost alternator output and recharge low batteries.

Unmatched Power and Speed
The V8 and V6 Pro XS outboards perform like no other, with a dual overhead cam design that delivers instantaneous throttle response and immediate power.

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

Lightweight Heavyweight
4.6L V8 and 3.4L V6 Pro XS outboards offer a combination of ample torque and less weight – ideal for heavier loaded boats.

HP / kW
300 / 224
Engine type
Conventional MidSection
Displacement (CID/CC)
279 CID
Displacement (L)
Cylinder Configuration
V-8 [64 degree] with Dual Overhead Cam [DOHC] and 32-valves
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
85-amp (1071 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 10W-30
Engine protection operator warning system
SmartCraft Engine Guardian
Compatible with SmartCraft digital technology
Electric Start with SmartStart Protection
Remote Mechanical or Digital Throttle & Shift (DTS)
Hydraulic (standard)
Power (optional)
Shaft length
20″ / 508 mm
25″ / 635 mm
Gearcase ratio
Dry weight *Lightest model available
511 lbs / 232 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
20″: Torque Master
25″: 5.44″
Trim system
Power trim and tilt
Exhaust system
Through prop
Counter Rotation
Phantom Black
Lubrication system
Wet sump
Oil Capacity
7.0 Quarts / 6.6 Liters
Maximum Trim Range
20° (-6° to 14°)
Maximum Tilt Range
73° (-6° to 67°)