---
id: should-i-choose-the-gas-or-diesel-engine-for-the-gmc-sierra-3500-hd
title: "Should I choose the gas or diesel engine for the GMC Sierra 3500 HD?"
category: faq
subtopic: sierra-3500hd-engines
page_type: faq
source_url: "https://www.markquartmotors.com/research/gmc/sierra-3500hd.htm"
tags: ["gmc", "sierra-3500hd", "powertrain", "duramax", "diesel"]
questions:
  - "What's the difference between the gas and diesel Sierra 3500 HD engines?"
  - "Which engine is better for towing?"
  - "What's the horsepower and torque of each engine?"
related: [sierra-3500hd-overview]
dealer: Markquart Motors
---

The Sierra 3500 HD offers two powerful engine choices:

**Gas Engine:** The standard 6.6L V-8 produces 401 horsepower and 464 pound-feet of torque. It's paired with a 10-speed automatic transmission and works great for typical hauling needs.

**Duramax Diesel:** The optional 6.6L turbo-diesel V-8 is the performance leader, generating 470 horsepower and 975 pound-feet of torque. It's mated to an Allison-certified 10-speed automatic and unlocks the truck's full 36,000-pound towing capacity. This engine excels if you regularly tow heavy loads.

Both engines are refined and responsive. The diesel gives you more muscle and maximum capability; the gas engine is a solid, capable choice for most work. Chat with the Markquart Motors team at (715) 833-0444 to discuss which suits your hauling demands best.