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Detroit DD15® Engine

Smart Power

The new Detroit DD15 engine delivers more with less weight, powering a new era in efficient driving.

Redefine the Road

With the DD15 you'll find an engine that delivers amazing power, control and fuel economy. It delivers peak torque at lower engine speeds so you burn less fuel and get more power.

Designed to Deliver

Our engineers re-examined, then re-designed many features of the DD15 to reach this level of performance, including:

  • Proprietary Asymmetric Turbocharger to reduce weight and complexity and deliver improved performance over other turbo designs. This patented in-house design is more optimally matched to the updated Exhaust Gas Recirculation (EGR) system to deliver outstanding performance.
  • Next Generation ACRS Fuel System optimizes DPF regenerations through combustion control to extend regeneration intervals.
  • DDEC® Electronic Engine Controls to adjust to driving conditions and respond immediately to your commands.
  • Fuel Filter Module uses a two-filter system for longer service life, increasing the service change interval to 50,000 miles.
  • Optimized Piston Design introduces a carbon scraper ring, reduces oil consumption, and contributes to improved fuel economy. The DD15 meets 2016 OBD (OBD16) and 2017 Greenhouse Gas (GHG17) regulations.
  • Variable Speed Water Pump utilizes the viscous clutch between the pulley and impeller drive to reduce impeller speeds, making it more efficient than a gear-driven design.
  • Oil and Fuel Filters are positioned above the frame rail
  • Detroit Virtual Technician® remote onboard diagnostics system can let you know how serious a fault code is when you're on the road. It can notify you of where the nearest part is located, when you can get into the next available service bay, and can even schedule your repair appointment for you.
  • Trained Technicians are ready to serve you at any of our 800-plus authorized service outlets.

Contact your local Freightliner or Western Star Trucks dealer to learn more about ordering the new DD15 in your new truck.

Detroit DD15 Engine

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