The Volvo Penta D4-300 Marine Diesel Engine 300hp is a compact 3.7L in-line 4-cylinder marine diesel engine designed for high-performance inboard propulsion, cruisers, sport boats, workboats, commercial craft, and repower projects. It delivers 300hp / 221 kW at 3500 rpm with common-rail fuel injection, turbocharging with charge air cooling, double overhead camshafts, heat exchanger cooling, and Volvo Penta Electronic Vessel Control. Built for strong marine torque, low fuel consumption, reduced noise and vibration, and long service life, the D4-300 is a strong choice for buyers who need compact Volvo Penta diesel power with advanced electronic control.

The Volvo Penta D6-370 Aquamatic Sterndrive Marine Diesel Engine is a 370hp marine diesel propulsion package combining a 5.5-liter six-cylinder diesel engine with an integrated Aquamatic sterndrive system. It features common-rail fuel injection, Variable Geometry Turbo (VGT), freshwater cooling, and electronic vessel controls for responsive propulsion and practical marine operation.

The Volvo Penta D6-435 Marine Diesel Engine is a 435hp inline six-cylinder marine diesel engine with a 5.5-liter displacement, common-rail fuel injection, double overhead camshafts, and turbocharging. Designed for demanding marine propulsion applications, it combines high output with a compact engine package, electronic control capability, and long-term serviceability.

The Volvo Penta D8-550 marine diesel engine is a high-performance 550hp in-line 6-cylinder marine diesel engine designed for sport boats, cruisers, commercial vessels, patrol craft, planing hulls, and demanding repower applications requiring strong acceleration, low weight, and efficient cruising power. Built around a 7.7L diesel platform, it features common-rail fuel injection, double overhead camshafts, a twin-entry turbo, supercharger support, Electronic Vessel Control, low noise operation, and a strong power-to-weight ratio. For buyers comparing Volvo Penta D8 engines, 550hp marine diesel engines, and compact high-output diesel repower options, the D8-550 is a serious premium propulsion choice.