Mercury 400L 400HP – Verado V10 20″ Shaft DTS Electric Start in Black

Mercury 400L 400HP Verado V10 DTS

The Mercury 400L Verado pairs a naturally aspirated 5.7L V10 with a 20-inch shaft, built as a primary power source for high-speed bay boats and performance multi-species rigs. At 695 lbs, this DOHC powerhead is part of Mulmarine’s outboard propulsion lineup, built for vibration-free running and the electrical capacity modern coastal rigs need.

Peak output holds through the 5800-6400 RPM range, backed by a 150-Amp alternator. The 2.08:1 gear ratio converts that 5.7L torque curve into strong hole-shot acceleration and top-end speed. Built in the USA, this engine pairs SmartCraft Digital Throttle & Shift (DTS) with integrated electro-hydraulic power steering for a cable-free feel across choppy inland and coastal water.

Technical Specifications of Mercury 400L Verado V10

5.7L V10 Naturally Aspirated Advantage

The 5.7L V10 skips forced induction in favor of raw displacement, which keeps power delivery smooth and predictable at high speed. That approach favors durability, quick hole-shots, and consistent power on long American coastal runs without the added complexity of a supercharger.

Integrated High-Output Power Steering

Mercury’s integrated electric/hydraulic power steering removes the external steering rams and hoses a traditional setup needs. That digital drive-by-wire control gives effortless, precise steering — valuable navigating tricky inlets or docking at speed in crowded marinas.

150A Industry-Leading Charging

A 150-Amp alternator generating 1890 Watts covers the load of modern performance boats running multiple displays, audio systems, and shallow-water anchors without draining the battery bank during long idles.

Mercury 3-Year Protection

Every Mercury 400HP Verado V10 carries a 3-year limited factory warranty, with genuine parts available through Mercury’s nationwide dealer network.

Maintenance & Longevity

Keeping the 8.0L wet sump system topped off with clean oil preserves the V10’s tight tolerances, and the cooling system needs a fresh-water flush after every saltwater outing. Pro Tip from the Shop: use the Top Cowl Service Door for daily oil checks, and confirm the SmartCraft NMEA Gateway is communicating properly with the digital helm before high-speed runs.