Detroit Gen 6 Engines
Built on a proven foundation. Ready for what's next.
For nearly a century, Detroit has helped customers keep trucks moving through evolving technologies, changing regulations, and demanding operating conditions. Gen 6 builds on that experience with a proven heavy-duty engine platform, proven emissions technology, and millions of miles of validation.
Backed by decades of engineering expertise, more than 1.2 million engines built, and over 8 million miles of testing, Detroit Gen 6 delivers the reliability, efficiency, capability, and confidence customers need for EPA 2027 and beyond.
A versatile, lightweight engine for vocational and regional duty.
Horsepower
410-525 HP
Torque Range
1450-1850 lb-ft
Displacement
12.8 L
An efficient, large displacement engine for higher annual mileage.
Horsepower
425-505 HP
Torque Range
1650-1900 lb-ft
Displacement
14.8 L
Big bore powerhouse for the hardest hauls and toughest tasks.
Horsepower
560-605 HP
Torque Range
1850-2050 lb-ft
Displacement
15.6 L
BUILT ON LEGACY AND PROVEN TECHNOLOGY
Gen 6 engines build on proven and familiar technology to make these advancements. The high pressure fuel system improves combustion with a simplified injector design. A wastegate turbocharger delivers consistent pressure, improving responsiveness and efficiency. The aftertreatment system leverages SCR technology—refined by Detroit since 2010 to achieve the most stringent emissions standards. And all this advancement is put through the paces before you put the engine to work—with over 8 million test miles and 3 years of extreme conditions testing.
Trust Detroit in your Freightliner or Western Star truck to comply with emissions without complicating your operation.
IMPROVED FEATURES INCLUDE:
Miller cycle intake timing improves efficiency by reducing the work of compression, and lowers combustion temperatures to lower NOx emissions.
Direct pressure, non-amplified fuel injectors maintained consistent, balanced fuel delivery in a simplified design, improving reliability.
A variable displacement oil pump regulates flow at low temperatures, feeding a lower pressure oil system to reduce power consumption.
The asymmetric turbocharger adds a wastegate valve to precisely control pressure across a wider operating range. This also improves engine braking performance and maintains heat for regenerations.
Detroit 1-Box aftertreatment adds pre-SCR technology to reduce nitrogen oxide to near-zero levels with no impact to engine performance.
WE KEPT THE CHANGES OUT OF YOUR WAY
Meeting EPA 2027 requirements shouldn't require customers to rethink the way they spec, operate, or upfit their trucks.
Detroit Gen 6 builds on proven technology and a familiar 1-Box aftertreatment architecture designed to fit within existing chassis space. With no back-of-cab protrusion, customers can maintain established configurations and upfits while preparing for what's next.