On April 24, it was reported that, starting in model-year 2025, the GMC Yukon AT4 variant will be available with a revised version OEM’s 3.0L Duramax in-line 6 turbodiesel. This same, revised unit also appears under the hood of the 2023 and newer Chevrolet Silverado 1500, GMC Sierra 1500, 2025 Chevrolet Suburban, and 2025 Tahoe.
Compared to its predecessor (3.0L I6 LM2), the new engine (3.0L I6 LZ20) features new steel pistons with revised combustion bowls, a retuned turbocharger compressor, new fuel injectors, and improved temperature control features.
Output for the new engine is rated at 305 horsepower (up from 277) and 495 lb-ft. (up from 460) of torque, good for an increase of 10% and 7.6% respectively. Efficiency is also improved, although details were not provided.
The refreshed Yukon will continue to be built at GM’s plant in Arlington, TX on the GM T1 platform.
(Multiple sources on April 25, 2024)