2025 Gmc Denali 2025 Duramax.  — general motors officially unveiled the fully refreshed 2025 gmc sierra hd last october, revealing an updated exterior, an overhauled interior, a new trim level. I recently purchased a 2025 gmc 1500 denali with the 3.0 duramax.

 — see all 37 photos. Gale starts by saying, “this is data that you won’t find on a spec sheet!” this new engine.