2025 RAM 2500 Performance: HEMI® V8 vs. Cummins Diesel

Given that 70% of RAM heavy-duty customers opt for the diesel engine, it’s no surprise that a new diesel engine joined the 2025 RAM Heavy-Duty lineup. This model year, drivers looking to upgrade their old diesel workhorses for something new can opt for the 2025 RAM 2500, which can now be had with the time-tested gas-operated 6.4L HEMI® V8 or the new 6.7L Cummins High-Output Turbo Diesel engine.

In this performance overview, Superior Dodge Chrysler Jeep Ram Of Northwest Arkansas presents details on the 2025 RAM 2500 Cummins specs to show you how much this engine improves the performance of this heavy-duty pickup compared to the steadfast HEMI® V8. From the horsepower output to the 0-60 times and more, we’ll compare the diesel specs with its well-known gas-powered mainstay so you can decide which engine is most appropriate for your needs.

2025 RAM 2500 Gas Engine Specs: The 6.4L HEMI® V8

Those who have driven a RAM Heavy-Duty pickup for a while will undoubtedly reminisce fondly about the 6.4L HEMI® V8 engine. Solidly constructed using a mixture of cast iron, aluminum, and forged steel, this gasoline-powered standby has proved its worth through more than a decade of rigorous use. Check out its specifications below:

• Horsepower: 405 hp @ 5,600 rpm
• Torque: 429 lb-ft of torque @ 4,000 rpm
• Maximum Engine Speed: 5,800 rpm
• Compression Ratio: 10.0:1
• Fuel Requirement: Unleaded, regular, 87 octane
• Oil Capacity: 7.0 quarts (6.6 liters)
• Coolant Capacity: 16.6 quarts (15.75 liters)
• Maximum Trailer Weight Rating: 17,750 pounds

2025 RAM 2500 Diesel Specs: The 6.7L Cummins High-Output Turbo Diesel I6

Boasting a best-in-class standard 1,075 lb-ft of torque straight out of the gate, the 2025 RAM 2500 Cummins specs are impressive indeed. Let’s see how the specs of this powerful inline 6 engine compare to the 6.4L HEMI® V8 in terms of the 2025 RAM 2500 horsepower specs and more:

• Horsepower: 430 hp @ 2,800 rpm
• Torque: 1,075 lb-ft of torque @ 1,800 rpm
• Maximum Engine Speed: 3,200 rpm (maximum high-idle engine speed)
• Compression Ratio: 16.2:1
• Fuel Requirement: Ultra-low sulfur diesel
• Oil Capacity: 12.0 quarts (11.3 liters) w/ filter
• Coolant Capacity: 23.8 quarts (22.5 liters)
• Maximum Trailer Weight Rating: 20,000 pounds

While the new 6.7L Cummins engine only improves on the horsepower specs of the 6.4L HEMI® by 25 ponies or so, keep in mind that the former is a diesel-powered engine and therefore achieves this with far lower engine speeds (5,600 rpm for the HEMI® versus 2,800 rpm for the Cummins). This makes the 6.7L Cummins a far more powerful engine than the HEMI® V8. While the latter certainly still has a place, for high-intensity projects where tremendous amounts of torque and power are required, it appears that the Cummins engine has a leg-up on the HEMI®.

In addition, the latest Cummins diesel engine also improves the RAM 2500 0-60 times, pushing it down to 6.9 seconds from 8.0 seconds in the 2024 model year So, not only does the 6.7L Cummins provide a legendary amount of towing power with the RAM 2500, it also quickens the pickup, potentially increasing its maneuverability on crowded roads.

Explore the Powerful 2025 RAM 2500 Today

Are you ready to test-drive a 2025 RAM 2500 with the latest 6.7L Cummins diesel engine? Then visit our dealership in Siloam Springs, and we’ll make it happen! Experience for yourself how much the RAM 2500 0-60 times improved from last year and get a glimpse of the sheer, raw power this engine can provide. Then once you’re ready, visit our finance center and take advantage of everything we offer, from our new vehicle specials and promotional offers to our excellent financing rates and flexible leasing options.