2025 RAM 2500 Cummins Specs & Engine Details
Performance Dodge Blog · New Vehicle Guide
2025 RAM 2500 Cummins Diesel Specs and Engine Details
Horsepower, torque, oil capacity and towing numbers for the 2025 RAM 2500 6.7L Cummins, compared side by side with the 6.4L HEMI V8, for drivers across Woodbury and Cherry Hill.
In This Article
- 2025 RAM 2500 Engine Options: HEMI V8 vs. Cummins Diesel
- Is the 6.7L Cummins a V8?
- Cummins vs. HEMI: Which Engine Fits You
- Cummins Oil Capacity, Coolant, and Maintenance
- Which 2025 RAM 2500 Trims Get the Cummins
- Cummins Towing and Performance Near Woodbury
- Test Drive the 2025 RAM 2500 Cummins
- Frequently Asked Questions
Key Takeaways
The 2025 RAM 2500 Cummins makes 430 hp and a best-in-class 1,075 lb-ft of torque
The 6.7L Cummins is a turbo diesel inline-six, not a V8, and it is not a “6.7 Hemi”
0 to 60 mph improves to 6.9 seconds on the 2025 model, down from 8.0 seconds in 2024
Cummins oil capacity is 12.0 quarts with a filter, versus 7.0 quarts on the 6.4L HEMI
Maximum trailer weight rating jumps to 20,000 pounds with the Cummins engine
Given that 70% of RAM heavy-duty customers opt for the diesel engine, it is no surprise that a redesigned diesel joined the 2025 RAM 2500 lineup. This model year, drivers across Woodbury, Cherry Hill, Camden and Deptford who are ready to upgrade an aging diesel workhorse have two solid choices: the time-tested 6.4L HEMI V8 or the new 6.7L Cummins High-Output Turbo Diesel inline-six.
Below, Performance Dodge RAM breaks down the full 2025 RAM 2500 Cummins specs, including horsepower, torque, oil capacity and towing numbers, and compares them directly against the gas-powered HEMI. Whether you searched for the 2025 RAM 2500 diesel, the 6.7 Cummins specs, or you are simply trying to figure out how much oil the Cummins 6.7 holds, you will find the answer here. For a broader look at the truck itself, our RAM 2500 research hub covers everything else you might want to know before you buy.
2025 RAM 2500 Engine Options: 6.4L HEMI V8 vs. 6.7L Cummins Diesel
RAM builds the 2025 RAM 2500 around two very different engines, and the right one depends on how you actually use the truck. The 6.4L HEMI V8 is the standard gas engine across most trims. The 6.7L Cummins, a 24-valve, high-output turbo diesel inline-six often shortened to “6.7 HO Cummins” or “6.7 I6 Cummins”, is the available upgrade for buyers who tow often, haul heavy loads, or want the extra durability diesel engines are known for.
2025 RAM 2500 HEMI V8 Gas Engine Specs
Drivers who have spent time behind the wheel of a RAM Heavy-Duty pickup know the 6.4L HEMI V8 well. Built from a mix of cast iron, aluminum and forged steel, this gas-powered engine has proven itself reliable through more than a decade of hard use. Its specs:
- Horsepower: 405 hp @ 5,600 rpm
- Torque: 429 lb-ft @ 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 6.7L Cummins High-Output Turbo Diesel I6 Specs
The 2025 RAM 2500 Cummins delivers a best-in-class 1,075 lb-ft of torque right out of the gate, which is a big part of why so many diesel shoppers land on this page. Here is how the 6.7 Cummins specs stack up:
- Horsepower: 430 hp @ 2,800 rpm
- Torque: 1,075 lb-ft @ 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) with filter
- Coolant capacity: 23.8 quarts (22.5 liters)
- Maximum trailer weight rating: 20,000 pounds
2025 RAM 2500 Engine Comparison at a Glance
| Spec | 6.4L HEMI V8 | 6.7L Cummins Turbo Diesel I6 |
|---|---|---|
| Configuration | Gas V8 | 24-valve, high-output turbo diesel I6 |
| Horsepower | 405 hp @ 5,600 rpm | 430 hp @ 2,800 rpm |
| Torque | 429 lb-ft @ 4,000 rpm | 1,075 lb-ft @ 1,800 rpm |
| Max engine speed | 5,800 rpm | 3,200 rpm |
| Compression ratio | 10.0:1 | 16.2:1 |
| Fuel type | 87 octane unleaded | Ultra-low sulfur diesel |
| Oil capacity | 7.0 qt (6.6 L) | 12.0 qt (11.3 L) w/ filter |
| Coolant capacity | 16.6 qt (15.75 L) | 23.8 qt (22.5 L) |
| Max trailer weight rating | 17,750 lbs | 20,000 lbs |
| 0 to 60 mph (2025) | Not published | 6.9 seconds |
While the new 6.7L Cummins engine only improves on the HEMI’s horsepower by about 25 ponies, keep in mind the Cummins achieves that with far lower engine speeds, 2,800 rpm versus 5,600 rpm for the HEMI. That is what makes the Cummins feel like a far more powerful engine under load, even though the horsepower gap on paper looks small.
Is the 6.7L Cummins a V8? Clearing Up a Common Question
No, the 6.7L Cummins is not a V8. It is a turbocharged, 24-valve inline-six (I6) engine, meaning all six cylinders sit in a single row rather than in two banks like a V8. That inline layout, combined with the turbo and the high 16.2:1 compression ratio, is exactly why the Cummins produces so much torque at such a low rpm compared to the HEMI.
It is also worth clearing up a related mix-up: the 6.7L Cummins is not a “6.7 Hemi.” HEMI refers to Chrysler’s own gas V8 engine family, built in-house. The Cummins diesel comes from Cummins Inc., a completely separate manufacturer with a long history of building heavy-duty diesel engines for trucks. RAM pairs the two brands because Cummins diesels have earned a reputation for durability that fits the 2500’s heavy-duty mission.
6.7L Cummins vs. 6.4L HEMI: Which 2025 RAM 2500 Engine Fits You
On paper, the 6.7L Cummins only beats the 6.4L HEMI’s horsepower by about 25 ponies. The real story is in how each engine gets there. The HEMI hits its peak at 5,600 rpm, while the Cummins does it at 2,800 rpm, roughly half the engine speed. That difference is what makes the Cummins feel so much stronger under load, and it is why the 2025 RAM 2500 Cummins posts a 0 to 60 mph time of 6.9 seconds, down from 8.0 seconds on the 2024 model.
If most of your driving is commuting, light hauling, or occasional towing, the 6.4L HEMI is a proven, lower-cost option that still handles a 17,750-pound trailer without issue. If you are regularly pulling equipment trailers, RVs, campers, or running the truck for job-site or commercial work, the extra torque, the 20,000-pound trailer rating and the diesel’s stronger resale value in the used market usually make the Cummins the better long-term choice. For a deeper side-by-side breakdown, see our full Cummins diesel vs. 6.4L HEMI comparison, or browse current used RAM 2500 trucks for sale in Woodbury if a pre-owned diesel fits your budget better. Curious how the 2500 stacks up outside the RAM badge? Our RAM 2500 vs. the competition page covers that too.
2025 RAM 2500 Cummins Oil Capacity, Coolant, and Maintenance
This is one of the most-searched questions we get about the 6.7 Cummins, so here is the straight answer: the 2025 RAM 2500 Cummins takes 12.0 quarts (11.3 liters) of oil with a filter change, compared to 7.0 quarts (6.6 liters) for the 6.4L HEMI. Coolant capacity is 23.8 quarts (22.5 liters) on the Cummins.
RAM recommends a full-synthetic diesel-rated oil for the 6.7L Cummins, and your exact service interval depends on how the truck is driven, since towing and heavy loads shorten the interval shown on the dash-mounted maintenance minder. Because the Cummins also runs diesel exhaust fluid (DEF) to meet emissions standards, keep an eye on the DEF gauge alongside your oil life, since a low DEF tank can limit engine power if it is ignored. Our service department handles Cummins-specific maintenance in-house, from oil and filter changes to DEF top-offs. Check our Dodge Ram maintenance schedule guide or ask about the advantages of synthetic oil for a heavy-duty diesel like this one.
Which 2025 RAM 2500 Trims Come With the Cummins Diesel
The 6.7L Cummins is available across most of the 2025 RAM 2500 lineup, from work-focused Tradesman and Big Horn trims through Laramie, Limited and Limited Longhorn packages, plus the off-road-oriented Power Wagon. Availability by trim and configuration can shift through the model year, so the most reliable way to confirm what is on the lot right now is to browse our current RAM 2500 inventory or call our sales team. If you want to see exactly what changed between model years, our 2025 vs. 2024 RAM 2500 breakdown covers it in detail, and shoppers already looking ahead can preview the 2026 RAM 2500 as well. Prefer to lease instead of buy? Our current RAM 2500 lease deals are worth a look before you decide.
2025 RAM 2500 Cummins Towing and Performance Near Woodbury, NJ
A 20,000-pound maximum trailer weight rating puts the Cummins-equipped RAM 2500 in a different class than most half-ton trucks, and it shows up in everyday use around South Jersey. Whether you are hauling a trailer up I-295, pulling equipment along Route 42 near Woodbury and Deptford, or towing a camper down to the shore for the weekend, the Cummins gives you the margin most gas engines cannot match. The quicker 0 to 60 time also means the truck merges and passes with a trailer attached more confidently than the outgoing model did. For exact figures matched to your build, see our full 2025 RAM 2500 towing capacity breakdown.
If your work demands even more capacity than the 2500 offers, our team can also walk you through the RAM 3500 and chassis cab lineup. Take a look at our RAM chassis cab research page for more on those heavier-duty options. And if you are shopping from the Cherry Hill side of the county, our RAM 2500 inventory for Cherry Hill drivers is just as easy to reach.
Test Drive the 2025 RAM 2500 Cummins at Performance Dodge RAM of Woodbury
Ready to feel the difference the 6.7L Cummins makes in person? Visit our dealership in Woodbury and we will get you behind the wheel. You can schedule a test drive online in a couple of minutes, and once you have decided, our finance center can walk you through financing or leasing options built around what you can actually afford. Run the numbers first with our payment calculator, and if you are upgrading from another vehicle, start with a free estimate through Value Your Trade. Be sure to check our current specials before you buy. Our team knows this truck inside and out, from the spec sheet to the service bay, and we are happy to answer any question that is not covered here.
Ready to Drive the 2025 RAM 2500 Cummins?
Visit Performance Dodge RAM in Woodbury, NJ, to see the 6.7L Cummins in person and talk through current offers with our local team.
View New RAM 2500 Inventory
Call 856-879-1947
555 Mantua Pike, Woodbury, NJ 08096
Frequently Asked Questions
Is the 6.7L Cummins a V8?
No. The 6.7L Cummins is a turbocharged inline-six (I6), not a V8. All six cylinders are arranged in a single row rather than two banks, which is part of why it makes so much torque at low rpm.
Is the 6.7 Cummins the same as a Hemi?
No. HEMI is Chrysler’s own gas V8 engine family. The Cummins is a diesel engine built by Cummins Inc., a separate manufacturer that RAM partners with for its heavy-duty diesel option.
How much horsepower and torque does the 2025 6.7L Cummins have?
The 2025 6.7L Cummins produces 430 horsepower at 2,800 rpm and 1,075 lb-ft of torque at 1,800 rpm, compared to 405 hp and 429 lb-ft on the 6.4L HEMI V8.
What is the oil capacity of the 2025 RAM 2500 Cummins diesel?
The 2025 RAM 2500 with the 6.7L Cummins holds 12.0 quarts (11.3 liters) of oil with a filter change. The 6.4L HEMI gas engine holds 7.0 quarts (6.6 liters) by comparison.
How many valves does the 6.7L Cummins have?
The 6.7L Cummins uses a 24-valve design, four valves per cylinder across its six cylinders, which helps it breathe efficiently under boost from the turbocharger.
What does “High Output” mean on the Cummins diesel?
High-Output, sometimes shortened to “HO,” refers to the tuned version of the 6.7L Cummins used in the 2025 RAM 2500. It is calibrated for higher horsepower and torque output than the standard-output version of the same engine.
What is the towing capacity of the 2025 RAM 2500 with the Cummins engine?
The 2025 RAM 2500 Cummins carries a maximum trailer weight rating of 20,000 pounds. Exact towing numbers vary by cab configuration, drivetrain and axle ratio, so check our towing capacity page for figures matched to your build.
What changed on the 2025 RAM 2500 Cummins compared to 2024?
The biggest change is performance. The 2025 model’s 6.7L Cummins improves the 0 to 60 mph time to 6.9 seconds, down from 8.0 seconds in the 2024 model year, while keeping the same class-leading torque output.
Which 2025 RAM 2500 trims can I get with the Cummins diesel?
The Cummins is available across most 2025 RAM 2500 trims, including Tradesman, Big Horn, Laramie, Limited, Limited Longhorn and Power Wagon. Availability can vary by build, so check current inventory or contact our sales team to confirm.
Should I choose the HEMI V8 or the Cummins diesel?
It depends on how you use the truck. The 6.4L HEMI is a strong, lower-cost choice for daily driving and occasional towing. The 6.7L Cummins makes more sense if you tow frequently, haul heavy trailers, or want the stronger resale value diesel engines typically hold in the used market.
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