---
id: what-engine-comes-standard-on-the-gmc-sierra-hd-denali-ultimate
title: "What engine comes standard on the GMC Sierra HD Denali Ultimate?"
category: faq
subtopic: sierra-hd-denali-ultimate-standard-engine
page_type: faq
source_url: "https://www.markquartmotors.com/research/gmc/sierra-hd/trims.htm"
tags: ["GMC", "Sierra HD", "Denali Ultimate", "Duramax diesel", "premium"]
questions:
  - "Does the Denali Ultimate have the diesel engine?"
  - "What engine is in the top Sierra HD?"
  - "Is the diesel standard on any trim?"
related: [sierra-hd-engine-options, sierra-hd-trim-overview]
dealer: Markquart Motors
---

Yes-the 2025 GMC Sierra HD Denali Ultimate comes with the **Duramax 6.6L Turbo-Diesel V8 as standard equipment**. That means you get 470 horsepower and a mighty 975 lb-ft of torque right out of the box, paired with the heavy-duty 10-speed automatic.

The Denali Ultimate is the pinnacle trim, combining that diesel muscle with luxury touches: massaging 16-way front seats, suede and leather Alpine Umber interior, advanced infotainment, head-up display, and premium styling throughout.

If you want the Duramax on a lower trim, it's available as an upgrade option. Call Markquart Motors at (715) 833-0444 to learn more about diesel availability and pricing across all Sierra HD trims.