2025 GMC Sierra 3500 Engine Specs
The 2025 GMC Sierra 3500 is a heavy-duty pickup truck engineered for exceptional strength and reliability.
Its 2025 GMC Sierra 3500 Engine Specs define its ability to tackle demanding tasks.
These tasks range from towing massive trailers to hauling heavy loads.
This article dives into the two powerful engines available.
It explores their specifications and how they cater to diverse needs.
Whether you’re a contractor, farmer, or adventure enthusiast, understanding the 2025 GMC Sierra 3500 Engine Specs is crucial.
This knowledge helps you select the right truck for your needs.
Why Engine Specs Matter
The engine is the core of any heavy-duty truck.
It determines towing capacity, payload, and efficiency.
The 2025 GMC Sierra 3500 Engine Specs offer a balance of raw power and advanced technology.
Choosing the right engine ensures optimal performance.
This performance is tailored to your specific workload.
This guide explores the 2025 GMC Sierra 3500 Engine Specs.
It aims to help you make an informed decision.
Overview of the 2025 GMC Sierra 3500 Engine Lineup
The 2025 GMC Sierra 3500 comes with two robust engine options.
Each is paired with a 10-speed Allison automatic transmission.
These engines are designed to handle the toughest jobs.
They deliver a refined driving experience.
Let’s break down the 2025 GMC Sierra 3500 Engine Specs.
We’ll highlight their unique strengths.
6.6L V8 Gas Engine: Reliable and Cost-Effective
The standard 6.6-liter V8 gas engine produces 401 horsepower.
It also generates 464 pound-feet of torque.
It’s a dependable choice for moderate towing and hauling tasks.
This engine supports a towing capacity of up to 20,000 pounds when properly equipped.
You can verify this on the official GMC Sierra 3500HD specifications page.
Its lower upfront cost appeals to budget-conscious buyers.
The gas V8 is ideal for urban driving.
It’s also great for towing mid-sized trailers like boats or campers.
Advanced direct fuel injection enhances efficiency.
This makes it a practical option.
This engine is a cornerstone of the 2025 GMC Sierra 3500 Engine Specs.
It offers everyday versatility.
6.6L Duramax Turbo-Diesel V8: Unmatched Power
The available 6.6-liter Duramax Turbo-Diesel V8 is a powerhouse.
It’s a standout among the 2025 GMC Sierra 3500 Engine Specs.
It delivers 470 horsepower.
It also produces an impressive 975 pound-feet of torque.
With a towing capacity of up to 36,000 pounds using a gooseneck hitch, it’s built for extreme tasks.
This is detailed in MotorTrend’s in-depth Sierra 3500HD analysis.
This engine excels in towing large trailers or heavy equipment.
It’s also perfect for fifth-wheel campers.
Its turbocharger and variable valve timing optimize performance.
They also improve fuel economy.
While pricier, the diesel offers superior longevity.
It provides efficiency for frequent heavy-duty use.
The Duramax is the top choice among the 2025 GMC Sierra 3500 Engine Specs.
It’s ideal for maximum capability.
Comparing Gas vs. Diesel Engines
The 6.6L V8 gas engine is affordable.
It’s sufficient for most tasks.
Its 401 horsepower and 464 pound-feet of torque suit light to moderate workloads.
In contrast, the Duramax diesel offers unmatched towing power.
Its 975 pound-feet of torque ensures effortless performance.
This is especially true with heavy loads.
Fuel economy favors the diesel.
Real-world tests show around 17 mpg on highways.
This is noted in Kelley Blue Book’s Sierra 3500 performance review.
The gas engine has lower fuel costs.
However, it offers reduced efficiency.
Your choice depends on workload intensity.
It also depends on your budget.
Both 2025 GMC Sierra 3500 Engine Specs deliver exceptional performance.
They are tailored to different needs.
Advanced Engine Technologies
The 6.6L V8 gas engine uses direct fuel injection.
This improves combustion.
It reduces energy loss.
It also boosts efficiency.
The Duramax diesel features a high-efficiency turbocharger.
This provides rapid response.
Variable valve timing enhances performance.
This applies across various conditions.
The 10-speed Allison transmission ensures seamless gear shifts.
It also improves towing stability.
These technologies are outlined in Edmunds’ detailed Sierra 3500HD specs guide.
They elevate the 2025 GMC Sierra 3500 Engine Specs above competitors.
They provide a refined driving experience.
This is true for heavy-duty tasks.
Towing and Payload Performance
The gas V8 supports a payload capacity of up to 7,442 pounds.
It tows up to 20,000 pounds.
This is ideal for boats, horse trailers, or construction materials.
The Duramax diesel handles up to 36,000 pounds.
This requires a gooseneck hitch.
Its payload capacity exceeds 7,200 pounds.
This is perfect for commercial applications.
These capabilities make the Sierra 3500 a leader in its class.
This is discussed in Driving.ca’s Canadian Sierra 3500HD evaluation.
The 2025 GMC Sierra 3500 Engine Specs ensure you’re ready for any challenge.
Conclusion
The 2025 GMC Sierra 3500 Engine Specs offer unmatched versatility.
They cater to heavy-duty truck buyers.
The 6.6L V8 gas engine is reliable.
It’s cost-effective for everyday tasks.
The 6.6L Duramax diesel delivers superior power.
It’s ideal for towing in demanding jobs.
Both engines incorporate advanced technologies.
These enhance efficiency and performance.
Choose the gas engine for versatility.
Opt for the diesel for extreme capability.
Explore the 2025 GMC Sierra 3500 Engine Specs to find your perfect truck.