How much transmission fluid does a 2015 Dodge Ram 2500 diesel hold?

In brief, the 2015 Ram 2500 with a Cummins diesel uses the 68RFE automatic transmission and holds about 15.8 quarts of ATF when filled with a fresh pan and filter. A full system flush can require around 18 quarts; a standard drain-and-fill will replace roughly 6–9 quarts per cycle.

To understand what those numbers mean for maintenance, here is a closer look at capacity figures and how different service methods affect the amount of fluid you’ll handle during a transmission service.

Transmission fluid capacity for the 2015 Ram 2500 diesel

The following figures assume a typical service with a new pan gasket and filter installed. Actual amounts can vary by vehicle configuration and service method.

Before mounting a list, note that the numbers below reflect common reference values used by technicians and official service literature for the 68RFE transmission used in the 2015 Ram 2500 diesel.

• Total ATF capacity (pan full with new filter, including torque converter): ~15.8 quarts (about 15 liters).


• Drain-and-fill volume per cycle: typically 6–9 quarts replaced in a single pass.


• Full system flush (machine-assisted exchange): approximately 18 quarts (about 17 liters) to completely refresh the fluid.

Because service methods vary and actual amounts depend on vehicle specifics, confirm with your owner's manual or a Chrysler dealer for VIN-specific specifications.

Service scenarios and best practices

Understanding the difference between a simple drain-and-fill and a full flush helps plan maintenance and budgeting for fluid costs.

Drain-and-fill vs. flush

Drain-and-fill typically replaces a portion of the transmission fluid and is a common maintenance task. A full flush uses a machine to push new fluid through the system, exchanging almost all the old fluid, which explains the higher total volume required.

• Drain-and-fill: about 6–9 quarts replaced; may require 2–3 cycles to achieve a near-full replacement.


• Full flush: around 18 quarts to fully refresh the system.

Keep in mind that the torque converter, cooler lines, and other internal passages may retain some fluid, so repeated servicing over time can more completely replace old ATF.

Summary

For the 2015 Dodge Ram 2500 diesel with the 68RFE automatic, the transmission holds roughly 15.8 quarts of ATF with a pan-and-filter change. A complete machine flush can require about 18 quarts to fully replace the fluid, while a single drain-and-fill cycle typically swaps 6–9 quarts. Always check the vehicle’s owner manual or consult a dealer for VIN-specific specs and recommended service intervals.

How many quarts of transmission fluid does a Dodge Ram 2500 take?

The transmission fluid capacity for a Ram 2500 depends on the engine and transmission. For a 68RFE diesel with a dry fill, it's around 17.5 quarts, but a standard pan drop and filter change only requires about 5.5 to 8 quarts. For a 66RFE gasoline engine, the dry fill capacity is 12.0 quarts, with a drain and refill requiring approximately 5.5 to 6.6 quarts. 
This video explains how to change the transmission fluid on a Ram 2500 with a 68RFE transmission: 59sAdventure EndeavorYouTube · Apr 4, 2023
By transmission type
This video demonstrates how to change the transmission fluid on a 2019 Ram 2500: 1mDoc's DieselYouTube · Nov 17, 2025

• 68RFE (Diesel):
  • Dry Fill: 17.5 quarts
  • Drain and Refill: 5.5 - 6.6 quarts
  • Drain, Filter Change, and Refill: 7.0 - 8.0 quarts (to account for fluid left in the filters and torque converter)
• 66RFE (Gasoline):
  • Dry Fill: 12.0 quarts
  • Drain and Refill: 5.5 - 6.6 quarts 

Important considerations

• Check the dipstick: Always check the fluid level on the dipstick after refilling and before finishing the job. Start the truck, let it reach operating temperature, and then check the level to add more as needed. 
• Drain and refill vs. dry fill: The capacity listed for a "dry fill" is for a complete transmission rebuild. A standard fluid and filter change will use significantly less fluid, as much of it remains in the torque converter and valve body. 
• Manual transmissions: If you have a manual transmission, check the capacity for your specific model, as the fluid requirements can differ significantly. 

What kind of transmission fluid does a 2015 Ram 2500 6.7 Cummins take?

Use the manufacturer-recommended transmission fluid, typically Mopar ATF+4 for the 2015 Ram 2500 Tradesman with Cummins turbo. Check fluid levels regularly via the transmission dipstick when warm and on level ground. Low or incorrect fluid can cause shifting issues and premature wear.

How many quarts does a 6.7 Cummins transmission take?

The 6.7L Cummins transmission fluid capacity depends on the specific transmission, but for the common 68RFE automatic, the service refill capacity is about 6.6 quarts when just dropping the pan and changing the filter. If you perform a full flush, you will need a greater amount of fluid. 
68RFE automatic transmission 

• Drain and refill: Approximately 6.6 quarts. 
• Drain, filter change, and refill: Approximately 7.0–8.0 quarts. 
• Total capacity: The total dry fill capacity is about 17.5 quarts, but a significant amount remains in the torque converter and other components during a standard service. 

Aisin AS69RC automatic transmission 

• Drain and refill: Approximately 7.2 quarts.
• Drain, filter change, and refill: Approximately 9.0–10.0 quarts.
• Total capacity: The dry fill capacity is about 13.7 quarts. 

Important considerations

• Transmission type: It's crucial to identify your specific transmission model (68RFE or Aisin) to get the correct fluid capacity. 
• Service type: The amount of fluid needed varies between a simple refill, a filter change, and a full flush. A flush requires significantly more fluid as you continuously add new fluid while draining the old. 
• Aftermarket pans: Some aftermarket pans have a larger capacity. For example, the PPE 68RFE pan adds about 3 extra quarts of capacity. 

How many quarts does a 2015 6.7 Cummins take?

A 2015 6.7L Cummins engine has an oil capacity of 12 quarts (11.4 liters) with a filter change. It is crucial to use the correct oil type, such as 5W-40 or 15W-40, depending on the climate, and to avoid overfilling the engine.
 
2015 6.7L Cummins oil specifications

• Capacity: 12 quarts (11.4 liters) with a filter change 
• Recommended oil: 5W-40 or 15W-40, with 5W-40 recommended for colder temperatures (below 0∘0 raised to the composed with power0∘F or -18∘negative 18 raised to the composed with power−18∘C) 
• Important note: After filling, always run the engine, check for leaks, then turn it off and wait for the oil to drain back before re-checking the dipstick to ensure the correct level and avoid overfilling.