Mercury 300HP 300L DTS Outboard – 20″ Shaft
The 300-horsepower Mercury 300L DTS uses a 20-inch shaft for compatible lower-transom boats. Digital throttle and shift provides precise engine control, while the outboard’s power supports offshore cruising, fishing, and utility applications.
Description
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Mercury 300HP 300L DTS Outboard Specs
| Brand | Mercury Marine |
| Full Model Code / Part Number | 300L DTS (20" Shaft) |
| Country of Origin | USA |
| Engine Type & Configuration | 4-Stroke Inline 6 (Supercharged with Verado SmartCraft) |
| Horsepower Output (HP / kW) | 300 HP (221 kW) |
| Displacement (cc / cu in) | 2600 cc (158 cu in) |
| Bore x Stroke (mm / in) | 82.0 x 82.0 mm (3.23 x 3.23 in) |
| Maximum RPM Range (Full Throttle Operating Range) | 5800 - 6400 RPM |
| Fuel Induction System | Sequential Multi-Port Electronic Fuel Injection (EFI) with Supercharger |
| Ignition System | SmartCraft ECM 0d Digital Inductive |
| Starting System | Electric Start with SmartStart Push Button |
| Steering System | Electro-Hydraulic Power Steering |
| Trim & Tilt System | Smart Craft Power Trim and Tilt |
| Gear Ratio & Shift Mechanism | 1.85:1 (Forward - Neutral - Reverse) |
| Exhaust System | Through Propeller |
| Recommended Transom Shaft Length | L: 20 inches |
| Alternator / Charging Output (Amps / Watts) | 70 Amp (Idle Charge Battery Management System) / 882 Watts |
| Recommended Fuel Grade & Oil Type | Regular Unleaded (Min. 87 Octane) / Mercury 4-Stroke Outboard Oil NMMA FC-W 25W-40 |
| Dry Weight (kg / lbs) | 268 kg / 600 lbs |
| Standard Warranty | 3 Years Limited Recreational Warranty |
Common Question of Mercury 300L DTS
What does 300L DTS mean?
It identifies a Mercury 300-horsepower outboard with Digital Throttle and Shift and a 20-inch shaft. DTS requires compatible electronic controls and rigging components. Confirm the electronic fuel injection system, steering, battery, wiring, gauges, transom height, and package contents before installing this high performance outboard motor.
Does it require digital controls?
Yes. Digital Throttle and Shift requires compatible electronic controls, wiring harnesses, gauges, battery capacity, steering equipment, and correct rigging. Conventional mechanical cables may not provide the intended engine interface. Verify the complete DTS system before installation so throttle and gear-selection commands operate correctly from the helm.
What shaft length does it use?
The shaft length is 20 inches, intended for a matching transom height. Measure the hull according to Mercury’s instructions before mounting. Correct shaft positioning supports cooling-water pickup, gearcase depth, propeller immersion, steering response, and trim. Proper measurement supports this ready to bolt marine installation.
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