February 1, 2026
Cox Marine Outboard Engines
Gillen Yacht Services has the marine industry’s best-kept secret! We are proud to be South Florida’s official dealer for Cox Marine Diesel Outboard Engines. They are in stock and ready for immediate installation! SCROLL DOWN TO LEARN MORE.
WHY BOAT OWNERS ARE MAKING THE SWITCH TO DIESEL OUTBOARD TECHNOLOGY
Independent testing demonstrates dramatic fuel savings which lowers operating cost and extends range.
Service-free centrifugal pump lasts the life of motor.
250-hour intervals for Cox Marine Diesel Outboard Engines vs. 100 hours for gas outboards.
Diesel motors have significantly more torque than a gasoline engine. Higher torque diesel motors allow heavier modern outboard boats to perform with less total horsepower.
Cox Diesel outboards have substantial annual savings resulting from fuel economy, decreased service intervals, and fewer parts replacements.
Diesel fuel is significantly less dangerous than gasoline. It also addresses the dual-fuel issue for tenders on large yachts. GYS can provide fueling options to utilize yachts main diesel fuel tanks.
Technology has been proven in both government and military applications since 2020. Recreational customers receive a 5-year – 1500-hour warranty.
Cox Marine CX0300 Diesel Outboard Engine Are Perfect For:
Complete Installation Services:
For Yacht Tenders: GYS can engineer and install a fuel transfer system for yacht tenders from current diesel fuel tanks on mother ship.
Check out what Independent testers say.
BoatTEST.com tested the Cox CXO300 Diesel Outboard motor on a Front Runner 26’ center console powered by a single Cox CX0300, resulting in the following:
Experience the Difference For Yourself
Feel the smooth acceleration, quiet operation, and impressive torque. We can arrange a demonstration on a Cox-powered boat.
Cox Marine Diesel Outboard Engines selected Gillen Yacht Services based on our 30+ years of expertise and comprehensive in-house capabilities across four South Florida locations. We provide complete sales, professional installation, warranty support, and ongoing maintenance.
Factory-trained and certified technicians
Four strategic South Florida locations PLUS mobile fleet and company aircraft
32 years of marine service experience
All marine trades in-house: Engineering, Fabrication, Mechanical, Electrical, Fuel Systems
Military, government, and commercial operators have been utilizing Cox diesel outboards since 2020. This proven technology is now gaining adoption among select recreational users as its operational benefits become more widely recognized.
Yes. While the initial investment is higher, diesel outboards are engineered to run longer, burn less fuel, and deliver significantly greater service life. When evaluated on total cost of ownership, diesel outboards often provide long-term savings.
No. Cox diesel outboards deliver performance comparable to gasoline outboards at normal cruising speeds, with strong torque available at lower RPMs.
Yes, diesel outboards are heavier. However, when compared to gasoline outboards producing similar torque, the weight difference is comparable. That additional mass contributes to increased durability, torque output, and reliability under load.
No. Cox diesel outboards utilize standard mounting patterns and conventional steering systems. Existing fuel tanks can remain in place, with the addition of a fuel return line.
Yes. Cox Marine’s global dealer network continues to expand, and Gillen Yacht Services provides parts and service support through mobile operations and company aircraft. GYS’s familiarity with clients’ vessels allows for efficient support regardless of where the yacht or tender is operating.
Cox Marine Diesel Outboard Engines offer a 5-year / 1,500-hour warranty, which exceeds the typical 3-year coverage found on gasoline outboards. The warranty covers all components except damage caused by misuse or abuse.
No. Noise levels are comparable to modern gasoline outboards.
No. Cox diesel outboards use common-rail high-pressure digital direct injection combined with twin turbocharging and aftercooling, resulting in clean operation and EPA Tier III compliance.
No. Cox diesel outboards do not require DEF or fuel additives
