A D’Aprix Marine Services repower project brought new life to a classic 1989 Mariner 3400 by integrating two modern Steyr Diesel SE286E40 engines. This repower combined cutting-edge performance and efficiency with timeless design, delivering both power and reliability without compromising the vessel's original charm. The Steyr SE286E40 engines are known for their compact size, low emissions, and smooth operation, making them ideal for refits where space and performance are both critical. The result is a vessel that not only maintains the elegance and classic appeal of the Mariner 3400 but also benefits from improved fuel efficiency, reduced noise, and enhanced maneuverability — a seamless blend of heritage and innovation.