2025 Mercury Marine® Mercury Diesel 550 Base

2025 Mercury Marine® Mercury Diesel 550

Take your life on the water to new destinations with the Mercury Diesel 6.7L engine. This turbocharged workhouse redefines diesel performance for sport yachts and other large vessels, blending premium comforts and extended range with exceptional speed and acceleration.

Features may include:

• The high-displacement turbocharged engine spools up massive torque, generating instantly responsive power to get big boats out of the hole and deliver a midrange punch when you need it.

• From vibration-dampening engine mounts to an air filter strategically positioned to also reduce turbo noise, the 6.7L engine is optimized for a smooth, quiet ride.

• The 6.7L engine is ready for all-season adventure, with a grid heater that makes cold weather starts easy.

• A thermostatically controlled closed-loop freshwater cooling system protects the engine in both fresh and saltwater.

• The high-pressure common rail (HPCR) fuel injection system fine-tunes the air-to-fuel ratio to enhance acceleration, top speed and efficiency.