The 2 millionth Duramax diesel engine rolls off the line.

General Motors is celebrating the production of the 2 millionth Duramax 6.6L V-8 turbo-diesel engine.

The Duramax diesel engines are mostly employed in heavy-duty Chevrolet Silverado and GMC Sierra pickup trucks, and they also power some Navistar commercial trucks, Gale Banks vehicles and even marine applications.

The current rendition of the popular Duramax 6.6L V-8 turbo-diesel boasts more horsepower and torque than ever—an SAE-certified 445 horsepower at 2,800 rpm and 910 lb-ft of torque at 1,600 rpm.

Along with a 19 percent increase in max torque over the last Duramax 6.6L, GM says the redesigned turbo-diesel’s performance is quieter and smoother, for greater refinement.