3.0L Duramax I-6

3.0L Duramax Specs, Ratings, & Information

General Motors will become the third and final of Detroit’s “Big 3” to establish a diesel platform for their half ton pickup line. In fact, GM’s new diesel for the Chevrolet Silverado and GMC Sierra will also become the third 3.0 liter diesel in the segment – both Ram Trucks and Ford Motor Company offer a 3.0L diesel in their respective ½ ton models. The 3.0L Duramax will be unique in that it will be the first and only inline engine in its class.

Note - this page is currently incomplete and information will be added as it is released.

GM’s exclusive I-6 Duramax is likely based on the architecture of the 2.8L I-4 found in the midsize Canyon/Colorado twins. However, the two engines will not share the same cylinder bore and stroke; taking the 2.8L engine’s bore and stroke combination and adding two additional cylinders results in a 4.16 liter engine. Thus, the engine may use the 2.8L’s stroke length with a smaller bore diameter or the 2.8L’s bore diameter with a shorter stroke length, but they will not share the same combination.

GM will compete head-on with Ram’s 3.0L EcoDiesel and Ford’s 3.0L Power Stroke V-6 engines. For the 2018 model year, the EcoDiesel produces 240 horsepower and 420 lb-ft of torque while the Power Stroke is rated up to 250 horsepower and 440 lb-ft of torque. Both engine platforms have earned EPA fuel economy ratings at or near the 30 mpg mark. The 3.0L Duramax I-6 will therefore need to encroach on these figures if they hope to enter the half ton diesel segment competitively. The midsize Colorado and Canyon diesels, a much lighter platform with a smaller frontal cross section, reaches 30 mpg with the 2.8L Duramax I-4.

It will also be interesting to see where the GMC Sierra 1500 and Chevrolet Silverado 1500 will land with regards to capability. Ford’s Power Stroke equipped F-150 tows up to 11,400 lbs and is rated to haul just over 2,000 lbs of payload. EcoDiesel equipped Ram 1500 models are rated to tow up to 9,240 lbs and haul up to 1,600 lbs of payload. Is GM designing a workhorse, fuel sipper, or an elegant combination of both?

The 3.0L Duramax will be mated to the 10L80 10 speed automatic transmission, which is identical to the transmission found behind Ford’s 3.0L Power Stroke – the development of the 10R80/10L80 transmission is the result of a partnership between the two manufacturers.

3.0L Duramax Diesel Specs


3.0L Duramax Diesel


Inline 6 cylinder (straight 6)

Assembly Location:


Years Produced:

2019 -

VIN Code:



3.0 liters (exact CID unavailable without bore and stroke dimensions)

Head/Block Material:


Compression Ratio:


Firing Order:












Oil Capacity:


Max Engine Speed:


Peak Horsepower:


Peak Torque:


2019 Chevrolet Silverado 1500

2019 Chevrolet Silverado 1500 will feature a 3.0L Duramax Inline 6 cylinder diesel