Mercury 250CXL SeaPro Commercial DTS

The used Mercury 250CXL SeaPro Commercial DTS is the top-horsepower V8 in this SeaPro family, 250 hp on a 25 inch shaft, meant for boats that earn their keep rather than sit at the dock most of the week. Commercial-duty specifications Mercury lists this block at 279 cubic inches (4.6 liters), a 64 degree bank topped by dual overhead cams working 32 valves, bore 3.6 inches, stroke 3.4 inches. Mercury caps this SeaPro's top end at 4800 to 5600 rpm rather than letting it spin higher, favoring torque over rpm for a boat working all day. Controls and care DTS controls are sold separately, and the motor supports mechanical or digital controls plus hydraulic, power, or Big Tiller steering. Electric start uses SmartStart Protection, and dry weight is 527 lbs. A SeaPro unit at this horsepower carries a 2 year limited standard warranty with unlimited hours for commercial applications, a different coverage structure than a recreational FourStroke gets. Against a smaller-displacement SeaPro CXL, the extra horsepower here matters most for boats that carry heavier loads or tow regularly, where the margin between cruise and full throttle gives more room to work. A fleet manager buying one of these should plan on the same maintenance interval discipline that any SeaPro demands, since the extended commercial warranty assumes the motor gets serviced on schedule rather than run until something fails. Is this rated for commercial duty? Yes, unlimited hours under its 2 year limited commercial warranty.