2024 Duramax. General motors announced a revised, more powerful version of the 6.6l duramax diesel for the updated 2024 model year gmc sierra and chevrolet silverado hd. Itโs one hell of a powerhouse, making 305 horsepower but 495.
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, improved piston. General motors has announced a customer satisfaction program (n232427750) addressing an issue with the piston oil lubrication valve in certain 2024 model.