Mercury 150 HP Electric Start, Steering, Trim and Tilt, Extra Long Shaft Outboard Motor

The Mercury FourStroke 150 XL EFI is a 4-stroke outboard marine engine designed for medium-sized fiberglass, aluminum, or inflatable boats requiring an extra-long shaft, suitable for boats 4–7 meters in length. It features a 150 HP / 110 kW and 3000 cc 4-cylinder engine. The FourStroke 150 XL EFI, with its 3000 cc 4-cylinder EFI FourStroke engine, offers efficient and reliable power to medium-sized boat users. Positioned within Mercury's most popular power range, this model stands out with its extensive service network and long-life advantage.

FourStroke 150 XL EFI Series Features and Technology Advantages

The 4-cylinder design provides balanced vibration and strong torque, ensuring stable cruising for medium-sized boats. EFI electronic injection offers reliable starting in all weather conditions and optimized fuel consumption.

• 4-Cylinder Engine (3000 cc): The 4-cylinder design provides balanced vibration and strong torque, ensuring stable cruising for medium-sized boats.
• Extra-Long Shaft (572 mm (22.5")): Ensures the propeller operates at the optimum depth for the correct transom height.
• EFI Electronic Injection: Easy cold starting and lower fuel consumption compared to carbureted alternatives.
• Electric Start: Instant activation with a key or button — comfortable and quick starting.
• Electric Trim and Tilt (Power Trim & Tilt): Adjust trim angle with a button while cruising — optimizes fuel efficiency; tilt allows the engine to be fully raised.
• Floating External Fuel System: Connection for a large-capacity external tank — range determined by user needs.

Extra-Long Shaft — Suitable for Which Boat Type?

The extra-long shaft (572 mm (22.5")) allows the propeller to operate at the correct water depth on large fiberglass and aluminum boats with high freeboards. It is 64 mm longer than the standard long shaft (508 mm).

Technical Specifications

Who Is This Engine For?

• Primary engine for 4–7 meter medium-sized boats: 4-cylinder balanced power and quiet operation.
• Fishing and coastal cruising: EFI economy for comfortable long journeys.
• Family boats and weekly use: reliable and low-maintenance power source.
• Rental boat applications: extensive Mercury service network and spare parts access.

Maintenance and Longevity

4-stroke Mercury engines operate smoothly for many years with regular oil changes and an end-of-season maintenance protocol. The impeller of the water-cooled system should be checked every 100 hours or every two seasons. Freshwater flushing is mandatory after every use in saltwater.

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

Frequently Asked Questions

What boat size does the Mercury FourStroke 150 HP engine fit?

150 HP power can fit different sizes depending on boat weight and type. General rule: 15–20 kg boat weight per HP. Always check the maximum engine power recommended by the boat manufacturer.

What advantage does the EFI system offer over a carbureted engine?

EFI (Electronic Fuel Injection) does not require a primer pump or choke adjustment. It provides reliable starting in cold weather and high altitudes, consistent power output, and lower fuel consumption compared to carbureted alternatives.

What are the maintenance intervals for the Mercury FourStroke?

Oil change at the first 20 hours, then oil change every 100 hours or once a season. Impeller check every two seasons. Freshwater flushing is mandatory after every use in saltwater. End-of-season fuel system protection is recommended.

Which boat and brand models are compatible with the FourStroke 150 XL EFI?

Mercury outboard motors are compatible with many fiberglass, aluminum, and inflatable boat models thanks to their universal transom clamp or mounting system. The only criteria are your boat's transom height of 572 mm (22.5") and the maximum engine power approved by the manufacturer. You can confirm compatibility with Clever Marin by sharing your boat model.

Related Products and Categories

• Mercury Outboard Motors
• Mercury Marine Products
• Mercury Spare Parts
• Mercury 40–60 HP FourStroke
• Mercury 75–150 HP FourStroke
• Outboard Motors
• 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 confirm together whether the Mercury FourStroke 150 XL EFI engine is suitable for your boat and ensure the correct shaft selection.