Mercury 300L DTS 300HP – Four Stroke Digital Throttle 20-Inch

Mercury 300L DTS 300HP V8 Standard

The Mercury 300L DTS is a high-performance 300HP FourStroke V8 outboard designed for strong acceleration and digital precision in the US coastal and inland marine market. Boasting a large-displacement 4.6L naturally aspirated 32-valve DOHC architecture and a dry weight of only 527 lbs, this engine utilizes a Conventional MidSection (CMS) to maximize power-to-weight efficiency. This 20-inch long shaft model features standard rotation, making it an primary power source for high-performance bay boats and tournament skiffs. Our reliable marine outboard engines provide the mechanical integrity necessary for both recreational and competitive operations.

Maximum operational performance for the Mercury 300HP V8 is seamlessly maintained within the 5200 to 6000 RPM full throttle band. The 1.75:1 gear ratio provides a mechanical advantage, translating 4.6L V8 torque into hole-shot acceleration for tournament fishing. Proudly manufactured in the USA, this corrosion-resistant marine engine incorporates SmartCraft Digital Throttle & Shift (DTS) to helps support a quiet, hyper-responsive ride across choppy American coastal waters.

Technical Specifications of Mercury 300L DTS

- The 4.6L V8 32-valve DOHC architecture delivers displacement for strong acceleration and instant throttle response.
- Conventional MidSection (CMS) design prioritizes weight savings and power for high-speed performance boat setups.
- SmartCraft Digital Throttle & Shift (DTS) replaces mechanical cables with digital data for flawlessly smooth gear engagement.
- An integrated 85 Amp alternator delivers 1071 Watts of charging power for tournament-grade electronics and livewell pumps.
- Electronic Fuel Injection (EFI) accurately manages the air mixture for thermal efficiency and reliable starts.
- SmartCraft PCM 112 Digital Inductive ignition provides exact spark timing for flawless idling and rapid hole-shot performance.

Naturally Aspirated V8 Power

The 4.6L V8 platform leverages a naturally aspirated DOHC design to eliminate the lag associated with forced induction. This “displacement over weight” philosophy translates to durability, instantaneous low-end grunt, and incredibly smooth power delivery during high-speed tournament runs.

SmartCraft DTS Control

Digital Throttle & Shift (DTS) technology removes the friction and maintenance of traditional control cables. This digital drive-by-wire system delivers ultra-smooth shifting and lightning-fast throttle response, providing vessel captains with a premium sports-car-like handling experience on the water.

20-Inch Hydrodynamic Shaft

The 20-inch shaft helps support the propeller operates at the optimal depth for maximum hydrodynamic grip on standard transoms. This design prevents cavitation and maintains consistent forward thrust on lightweight deep-V hulls and fast coastal bay boats navigating through unpredictable chop.

Idle Charge Technology

Mercury’s idle-charge battery-management technology, paired with the 85 Amp alternator, automatically increases idle RPM to boost alternator output and recharge low batteries. This is a game-changer for anglers running multiple 12-inch displays and livewell pumps simultaneously throughout the tournament day.

Mercury Factory Warranty

Every Mercury 300HP V8 outboard is backed by a standard 3-Year Limited Warranty for American owners. This factory-level protection helps support long-term peace of mind and grants access to genuine parts through a vast nationwide marine dealer network.

High-Speed Tournament Match

This 20-inch DTS outboard is a practical power solution for fiberglass bay boats, performance pontoons, and aluminum multi-species rigs. It provides the sustained high-end thrust needed for navigating difficult coastal tidal flows while remaining fuel-efficient during transit.

Maintenance & Longevity

Regular maintenance of the 7.0L integrated wet sump lubrication system is vital for preserving the engine’s tight mechanical tolerances. Always flush the internal cooling passages with fresh water after each saltwater excursion.Maintenance note: Follow the manufacturer’s service procedures and lubrication specifications for the engine and gearcase.