What engine is in the Silverado 2500?
The Silverado 2500HD is offered with two main engine options: a 6.6-liter gasoline V8 and a 6.6-liter Duramax turbo-diesel V8. The gasoline engine outputs about 401 horsepower and 464 lb-ft of torque, while the diesel delivers roughly 445 horsepower and 910 lb-ft of torque. Both powertrains are paired with a heavy-duty automatic transmission suited for demanding work, depending on year and configuration.
Engine options
The Silverado 2500HD’s purpose-built powertrains are focused on durability and torque for hauling and payload. Here are the two engines you can typically choose from:
- 6.6L V8 gasoline engine (L8T) — approximately 401 horsepower and 464 lb-ft of torque.
- Duramax 6.6L turbo-diesel V8 (L5P) — approximately 445 horsepower and 910 lb-ft of torque.
The two engines are designed to meet different needs: the gasoline option offers strong on-road performance and easier refueling, while the diesel emphasizes high torque for sustained, heavy-duty towing and hauling. Both configurations use a heavy-duty automatic transmission.
Performance and capability
Power and torque figures vary by model year, cab/bed configuration, drivetrain, and equipment packages. In general, the gas engine delivers robust horsepower for highway use and work-ready torque, while the diesel provides superior low-end torque for towing and sustained heavy loads. Your choice will depend on how you plan to use the truck, fuel availability, and long-term maintenance considerations.
Which engine fits your needs?
For buyers prioritizing maximum torque for long hauls and frequent heavy towing, the Duramax diesel is typically the preferred option. If you anticipate more highway driving with occasional heavy towing and want shorter refueling stops, the gasoline engine can be a strong, capable alternative. Both engines are designed to handle tough work cycles when properly equipped.
Summary
The Chevrolet Silverado 2500HD offers two solid engine choices: a 6.6-liter gasoline V8 and a 6.6-liter Duramax turbo-diesel V8. The gasoline engine delivers around 401 hp and 464 lb-ft of torque, while the diesel produces about 445 hp and 910 lb-ft. Each engine is paired with a heavy-duty automatic transmission and engineered to support heavy payloads and towing, with the diesel delivering higher torque for sustained demanding use. The best choice depends on your typical workload, fuel availability, and maintenance preferences.
What engine does a Silverado 2500 have?
Comparing the Chevy Silverado 2500 Gas Engine (6.6L V8) to the Diesel Engine (6.6L Duramax V8): Choosing between the gas and diesel versions of the Chevrolet Silverado 2500 HD can be a tough decision. Both engines offer impressive capabilities, but they each have their own strengths and weaknesses.
What is the difference between the 6.0 and the 6.0 Vortec Max?
The Vortec Max is a higher-output version of the standard 6.0L Vortec engine, featuring more horsepower, torque, and towing capacity due to its higher compression pistons (LQ9). It was primarily offered in high-trim models like the Silverado and Sierra, often bundled with other heavy-duty upgrades such as a reinforced suspension, locking differential, and a heavy-duty transmission.
| Feature | 6.0L Vortec | 6.0L Vortec Max |
|---|---|---|
| Performance | Standard output | High output (more horsepower and torque) |
| Key Difference | Standard pistons (LQ4) | Higher compression pistons (LQ9) |
| Towing Capacity | Standard for the vehicle's configuration | Higher capacity (up to 10,000 lbs) |
| Vehicle Trim | Offered in a wider range of models and trims | Typically limited to high-trim packages |
| Associated Upgrades | Standard components | Reinforced suspension, locking differential, heavy-duty transmission (4L65E) |
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What year 2500hd to avoid?
Years to avoid for the Chevrolet 2500HD include the mid-2000s (specifically 2003-2006) due to electrical gremlins and build quality issues, the 2014-2017 models, which had problems with transmissions, HVAC, and steering/suspension, and some 2020-2023 Ram 2500HD models that faced recalls for electrical fires and other issues.
Chevrolet Silverado/GMC Sierra 2500HD
- 2003-2006: These models are often cited for electrical problems, poor build quality, and HVAC and engine management issues.
- 2014-2017: This range had issues ranging from major recalls to widespread complaints about transmissions, with the 2017 model particularly noted for transmission problems.
- 2020-2022: Some owners suggest avoiding models from this period due to concerns about build quality and parts inferiority, especially related to the 2020 redesign.
Ram 2500HD
- 2020-2023: These model years have been subject to recalls for issues like electrical shorts and fire risk, as well as intake heater grid relay problems.
Is the 2025 6.6 Duramax a good engine?
The 2025 6.6L Duramax diesel engine in trucks like the Chevy Silverado HD and GMC Sierra HD is praised for its immense torque (970−975970 minus 975970−975 lb-ft) and power (470470470 hp), making it highly capable for towing and hauling. It is paired with an Allison 10-speed transmission and offers a smoother, more refined driving experience than previous versions. While it excels at heavy-duty tasks, reviews also note the importance of adhering to its specific maintenance requirements.
Performance and capability
- Engine: The 6.6L Duramax turbo-diesel V8 produces 470470470 horsepower and 975975975 lb-ft of torque.
- Towing and Hauling: The massive torque makes it feel effortless when towing heavy loads, with a maximum towing capacity of up to 20,000 pounds when properly equipped with a gooseneck or fifth-wheel hitch.
- Transmission: It is paired with an Allison 10-speed automatic transmission, which provides smooth and consistent shifting.
- Driving experience: Reviews suggest the engine provides a more refined driving experience compared to some competitors, with less clatter and a more car-like feel.
Fuel efficiency
- While official EPA ratings aren't available for every configuration, real-world testing suggests the Duramax can be more efficient than its gasoline counterparts, with some tests showing over 20 MPG on a highway loop.
- The gas engine is still a viable option for drivers who don't tow heavy loads regularly, offering lower upfront costs.
Maintenance and reliability
- The 6.6L Duramax has a strong reputation for longevity, but modern diesel engines require dedicated maintenance to ensure long-term reliability.
- Following the manufacturer's recommended service schedule is crucial, especially since modern diesel engines can require more specific care than their gas counterparts.
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