What is the capacity of the Ram 2500 diesel?
The Ram 2500 diesel uses a 6.7-liter Cummins turbo-diesel inline-six engine.
The exact capacities can vary by model year and configuration, but this engine size is the core capacity of the Ram 2500’s diesel option. Below is a look at the principal figures buyers and owners typically consider, along with notes on how they can vary by year and setup.
Core engine capacity
Key figures tied to the Ram 2500’s diesel engine capacity are outlined below.
- Displacement: approximately 6.7 liters
- Engine configuration: turbocharged inline-six (I6)
In practice, this capacity translates into strong torque characteristics that define the truck’s capability, while exact power output depends on the specific model year and tuning.
Fuel capacity and related practical capacities
When evaluating a diesel pickup, fuel capacity and resulting range matter for planning and usage.
- Fuel tank capacity: typically 31 gallons (117 liters) in most Ram 2500 diesel configurations
- Driving range varies with road conditions, payload, and towing demands
Note that some configurations with different cab/bed combinations can show slight variations in tank size. Always verify the exact spec for the specific truck and year you’re considering.
Notes on year-to-year variability
Capacities can shift with design updates, emissions requirements, and option packages. The 6.7L Cummins has been the consistent diesel option for the Ram 2500, but precise numbers and available configurations have evolved across generations.
Model-year and configuration variations
When shopping or maintaining a Ram 2500 diesel, confirm the exact figures for your year, cab style, and bed length, as these factors can influence tank size and other capacity-related specs.
Summary
In short, the Ram 2500 diesel’s core capacity is its 6.7-liter Cummins turbo-diesel inline-six. Additional capacities to note include a typical 31-gallon fuel tank and variations by year and configuration. For precise numbers, consult the official Ram spec sheet for your exact truck.
How many gallons of diesel does a Dodge Ram 2500 hold?
Stop at next to nothing with an available fuel tank capacity of 50 gallons on 2026 Ram 2500 Crew Cab models with 8-foot bed.
Which year 6.7 Cummins to avoid?
Years to be cautious with the 6.7 Cummins include 2007-2012 due to initial emissions system issues and potential DPF clogging, and 2019 and newer due to a known lifter failure problem that can cause engine damage. The 2019-2020 models can also be avoided because of the CP4 high-pressure fuel pump, which is more prone to failure.
This video explains the top 5 issues with the 6.7L Cummins engine: 52sGetty's GarageYouTube · Jun 17, 2022
Years to be cautious with
- 2007–2012: These years saw the introduction of the 6.7L engine with its emissions system. Initial designs were prone to issues, particularly with the DPF, which could lead to clogging and power loss.
- 2019–2020: These model years are known to have a problem with the CP4 high-pressure fuel pump, which can fail and cause catastrophic damage to the fuel system.
- 2019 and newer: These models have a known issue with hydraulic lifters that can fail, potentially leading to camshaft and engine damage if not addressed quickly.
What to look for
- Pre-2013 models: Be prepared to address potential DPF clogging issues through proper driving habits or modifications.
- 2019+ models: Be aware of the risk of lifter failure and be ready to either address it immediately or look for a truck with an updated or aftermarket system. The CP4 pump is also a concern for 2019-2020 models.
This video discusses issues with Cummins engines and potential fixes: 51sGetty's GarageYouTube · Mar 10, 2025
Disclaimer
- These are generalizations based on common reports. Not all engines from these years will have these problems.
- Maintenance, driving style, and specific configurations can significantly impact the reliability of any engine.
- If you are considering a 6.7 Cummins, it is always recommended to have a pre-purchase inspection by a qualified mechanic.
How many gallons does a 6.7 l Cummins hold?
A 6.7L Cummins engine typically takes 12 quarts (or 3 gallons) of oil, although the exact capacity can vary slightly by model year. For 2019 and newer models, the capacity is 12 quarts with a filter change, and for older models (2007.5–2018), it is also 12 quarts with a filter change.
- Oil: A 6.7L Cummins engine requires about 12 quarts (or 3 gallons) of engine oil.
- Model year variations: While 12 quarts is the standard for most modern engines, older models may have slightly different capacities, so it's always best to check your owner's manual or use the dipstick to confirm.
- Coolant: The coolant capacity for a 4th generation 6.7L Cummins (2010-2018) is about 5.7 gallons.
- DEF (Diesel Exhaust Fluid): The DEF tank size is 5.5 gallons for 4th generation models (2010-2018).
- Fuel: The stock fuel tank can hold approximately 32 gallons on a 4th generation model, but aftermarket tanks with larger capacities are available.
What is the capacity of the Ram 2500 diesel bed?
The payload capacity for a Ram 2500 with a diesel engine varies based on the model year and configuration, but it is typically around 2,700 to 2,760 pounds. This is lower than the gasoline engine models due to the diesel engine's extra weight. The bed dimensions are available in a standard 6-foot 4-inch size (57.5 cubic feet) or a long 8-foot size (74.7 cubic feet).
| Bed Size | Length | Storage Volume |
|---|---|---|
| Standard | 6'4" | 57.5 cubic feet |
| Long | 8' | 74.7 cubic feet |
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Diesel Ram 2500 payload capacity
- 2025 Ram 2500 diesel: Up to 2,740 pounds
- 2024 Ram 2500 diesel: Up to 2,760 pounds
- Example (2025 diesel): A 4x4 Mega Cab configuration can have a max payload of 2,020 pounds.
Key factors affecting payload
- Engine: The diesel engine is heavier than the gasoline engine, which reduces the available payload capacity.
- Cab and bed configuration: The combination of cab type (Regular, Crew, Mega) and bed length (6'4" or 8') will impact your total capacity.
- Drivetrain: A 4x4 configuration will have a different payload capacity than a 4x2 configuration.
- Individual vehicle sticker: The most accurate payload capacity for your specific truck is listed on the sticker inside the driver's door jamb.
