2025 Duramax 3.0 Specs. 95 percent of peak torque happened at 1,250 rpm. The truck's l5p duramax diesel engine received a substantial bump in power and torque thanks to a stout list of upgrades, including a new turbocharger,.
We go over more details. In terms of specs, the big changes are the peak power and torque figures, with the new 3.0l i6 lz0 turbodiesel duramax engine producing a maximum of 305 horsepower at 3,750 rpm and 495.