Detroit DD15 Engine

Six cylinders of industry-leading power

The DD15® builds upon the Detroit heavy-duty engine legacy to bring efficiency and performance to the next level. Offering the best of the best in diesel engine technology and engineering, the DD15 provides unmatched reliability for your trucks.

In addition to meeting GHG 2021 standards, the engine touts impressive power ratings, an innovative aftertreatment system and other key features to increase efficiency, durability and performance. Designed with enhanced downspeeding for better fuel economy and a swirl piston design for maximum combustion, the DD15 is up to three percent more fuel efficient than our previous model.

Brochures and Videos Maintenance Intervals and Warranties

1550-1850 lb-ft

Torque Range

425-505 HP




The DD15 engine has been significantly redesigned with innovative new features, building on the legacy of the most popular Class 8 diesel engine in North America.

More Specs


The best 6-cylinder diesel engine available in the heavy-duty commercial vehicle market just got even better. The DD15 builds upon proven Detroit® technology to offer industry-leading efficiency, performance and durability. Key design features include:

  • Better combustion  for better fuel economy
    • Ultra-high compression ratios paired with a new swirl piston design create better combustion—and up to 3% better fuel economy. Now more than ever, the DD15 has continued to prove itself as the industry leader, and one of the most efficient 6-cylinder diesel engines for sale in the market.
  • Versatility to be used in a wide range of applications
    • New power ratings and greater application coverage make this diesel engine powerful and durable - no matter what job it needs to do.
  • Enough power to get payloads moving quickly
    • A Ball Bearing Simple Geometry Turbo allows peak power and torque to be reached faster, which gets payloads moving without compromising efficiency.
  • Shorten regen cycles with new aftertreatment system
    • The innovative Thermocoasting features prevents aftertreatment system cool down during coasting and shortens regen cycles. This feature is one more way Detroit has continued to develop cutting-edge innovation on diesel particulate filters and aftertreatment systems, with the goal of decreasing potential ATS problems and increasing uptime.
  • Greater reliability than ever before
    • The engine offers less complexity and more durability in many of its key components to achieve an even higher standard. The DD15 is already one of the most reliable diesel engines ever made, this generation builds upon that legacy with expertly engineered improvements in engine technology.
  • Longer maintenance intervals
    • A new aftertreatment system is able to do more with less space, increasing ATS maintenance intervals.
  • Detroit’s trusted service and technology
    • Detroit’s #1-rated service network, along with the Detroit Connect Virtual Technician® remote diagnostic system, helps maximize uptime.

Model Options

Designed for a range of on-highway and vocational applications.

Western Star
Find a Dealer

Detroit Connect Virtual Technician remote diagnostic system

If maintenance issues come up while on the road, you can count on Detroit Connect Virtual Technician®. With Virtual Technician, you are notified within minutes when your vehicles experience a fault event, the severity of the fault and when, where and how to best fix the issue causing the fault so you can make informed service decisions.

Keep running

With the longest service intervals in its class and an easily serviceable design, the Detroit DD15 lowers your cost of ownership by decreasing your time in the shop. With oil and fuel filters positioned above the frame rails, you'll be back in the driver's seat fast.


Sharing common service operations and parts with the DD13 and DD16 ensures that trained technicians are ready to serve you and your DD15 at any of our 800+ authorized Detroit locations across the highways and back roads of North America.


Detroit Integrated Powertrain Brochure Cascadia Detroit Engines Driver Card - French Cascadia Detroit Engines Driver Card - Spanish Cascadia Detroit Engines Driver Card DD15 | Engine Vocational Spec Sheet | Detroit DD13 | Engine On-Highway Spec Sheet | Detroit DD15 | Sell Sheet | Detroit DD15 | Engine OH Spec Sheet | Detroit


Detroit Engines Trinity Image DD15 | Image | Detroit DD15 | Image_v2 | Detroit DD15 | Right Side Image | Detroit DD15 | Right Side Image_v2 | Detroit DD15 | Left Side Image | Detroit DD15 | Left Side v2 | Detroit


Detroit Engine Assembly Video PasSmart Training Video Pre-Trip HD Engine Inspection of Belts Training Video Ralenti optimizado - Motor encendido - Video de entrenamiento Optimized Idle - Engine Not Running Training Video Optimized Idle - Engine Running Training Video Optimized Idle - System Safety Loops Training Video Parked Regen GHG17 Dash Cluster - Overview Training Video DD15 | Vocational Features | Detroit Video de entrenamiento del sistema de autoelevado de ralenti - Posttratamiento Regeneracion Estacionaria GHG17 - Cluster Dash - información general d - vídeo Ralenti optimizado - Motor apagado - vídeo de entrenamiento DD15 | On-Highway Features | Detroit Ralenti optimizado - Video de entrenamiento de bucles de seguridad del sistema


Maintenance Intervals


Find a Dealer

Locate a Dealer