Mercury 300 HP Verado Electro-Hydraulic Steering Trim and Tilt Ultra Long Shaft Outboard Engine

The Mercury Verado 300 XXL is a 4-stroke outboard marine engine designed for premium yachts, large luxury boats, and multi-engine professional applications requiring an ultra-long shaft, featuring 300 HP / 221 kW and a 4600 cc V8 (8-cylinder) engine. The Verado series encompasses Mercury's most advanced outboard engines in the premium segment. It has been specifically developed for high-end yachts and large boats with an AMS (Advanced Mid Section) gearbox and an electro-hydraulic steering system.

Verado 300 XXL Series Features and Technology Advantages

Electro-hydraulic steering eliminates the need for mechanical cables — providing exceptional maneuverability precision and comfort. The AMS gearbox optimizes power transfer, increasing fuel efficiency. Active Trim automatic trim management comes standard.

• V8 (8-Cylinder) Engine (4600 cc): Electro-hydraulic steering eliminates the need for mechanical cables — providing exceptional maneuverability precision and comfort
• Ultra-Long Shaft (635 mm (25")): Propeller operates at optimum depth with correct transom height
• Electro-Hydraulic Steering: No mechanical cables — precise maneuver control and low steering effort
• Electric Start: Instant engagement with key or button — comfortable and quick start
• Power Trim & Tilt: Adjust trim angle with a button while underway — fuel efficiency optimization; full engine lift with tilt
• External Floating Fuel System: Connection for large capacity external tank — range determined by user need

Ultra-Long Shaft — What Boat Type is it Suitable For?

The ultra-long shaft (635 mm (25")) keeps the propeller at an optimum depth on large yachts and professional boats with deep transom designs. Incorrect shaft selection can leave the propeller out of the water or drag on the bottom — measure your transom height before installation.

Technical Specifications

Who is This Engine For?

• Premium yacht and luxury large boat: ultimate comfort with electro-hydraulic steering and AMS gearbox
• Multi-engine configuration: consistent power delivery and DTS synchronization
• Long-distance offshore cruising: Active Trim and automatic fuel management
• Luxury yacht rental and charter: high reliability and low maintenance costs

Maintenance and Longevity

4-stroke Mercury engines run smoothly for many years with regular oil changes and end-of-season maintenance protocols. Impeller inspection for the water-cooled system should be done every 100 hours or every two seasons. Fresh water flushing is mandatory after every use in saltwater.

Related maintenance categories: Maintenance Kit | Engine Oil | Impeller | Mercury Spare Parts

Frequently Asked Questions

What is the main difference between the Verado series and standard FourStroke?

Verado offers an AMS (Advanced Mid Section) gearbox and electro-hydraulic steering system. Its design, which does not require mechanical cables, provides more precise maneuverability and lower maintenance. DTS digital throttle makes multi-engine synchronization easier.

How does the electro-hydraulic steering system work?

The electro-hydraulic system transmits steering movement via an electronic signal to a hydraulic actuator. Without mechanical cable friction, it provides much lower steering effort and higher precision. In multi-engine applications, simultaneous turning of engines is automatically coordinated.

What does the Active Trim system do?

Active Trim automatically optimizes the trim angle using GPS speed and acceleration data. It eliminates the need for manual trim adjustments during speed changes — fuel consumption and cruising comfort are continuously optimized.

Which boat and vessel brands are compatible with the Verado 300 XXL?

Mercury outboard engines are compatible with many fiberglass, aluminum, and inflatable boat models due to their universal transom clamp or transom mounting system. The only criteria are your boat's 635 mm (25") transom height and the maximum engine power approved by the manufacturer. You can get compatibility confirmation from Clever Marin by sharing your boat model.

Related Products and Categories

• Mercury Outboard Engines
• Mercury Marine Products
• Mercury Spare Parts
• Mercury Verado 175–400 HP
• Mercury Verado 350–500 HP
• Outboard Engines
• Boat Engines
• Maintenance Kit
• Impeller
• Anode

Is This the Right Configuration for Your Boat?

Share your boat model, transom height, and intended use — let's verify together if the Mercury Verado 300 XXL engine is suitable for your boat and ensure the correct shaft selection.