About DMAX

DMAX Ltd.DMAX Ltd. is a subsidiary of General Motors, LLC. The redesigned Duramax 6.6L V-8 turbo-diesel offered on GMC Sierra and Chevrolet Silverado HD pick-up trucks, offers more horsepower and torque than ever — an SAE-certified 445 horsepower (332 kW) and net 910 lb.-ft. (1,234 Nm) — to enable easier, more confident hauling and trailering. The redesigned turbo-diesel’s performance is quieter and smoother, for greater refinement, reducing engine noise at idle by 38 percent.

Location 3100 Dryden Rd
Moraine, Ohio. 45439 United States
Year Opened 1999
Facility Size 584,000 square foot facility

Employee Information

Hourly 670
Salaried 126
Total Approximately 800
Union Local IUE-CWA Local 755

The Duramax History of Durability

With over 2 million Duramax diesel engines put into operation since its launch in 2000, no other automaker has as much diesel engine development experience for meeting the demands of the heavy-duty truck customer.


Moraine Manufacturing Facility and outside Warehouse; Reliability offices in Michigan


$82 million announced December 2015 for future Duramax diesel engine-related productivity improvements, creating approximately 800 jobs over the next three years

$69 million investment announced on February 2008 for production of new 2010 Duramax 6.6-liter V8 diesel engine

$60 million investment announced February 2014 for production of the 2017 Duramax 6.6L V-8 diesel engine


DMAX Awards:

  • JD Power 2014 Best in Segment Award

GM State Economic Impact

  • State Wages: $715,453,660.04
  • Income Tax: $25,197,357.09

What Makes Duramax Diesel 6600 V8 EngineGreat?

  • Unique fuel injection system
    • Reduces noise and emission levels
  • Rigid block design reduces noise
  • 397 h/p @ 3000 rpm
  • 660 ft/lbs torque @ 1600 rpm
    • Greater power and increased payload
  • Each engine cycled through hot test
    • Strict engine performance, diagnostics and function testing
    • Eight (8) minute test cycle