How often do you change the transmission fluid in a Ram 2500 diesel?

In most Ram 2500 diesel pickups with the 6.7-liter Cummins engine and the 68RFE automatic transmission, a transmission fluid and filter service is typically performed about every 60,000 miles under normal driving conditions. If you regularly tow heavy loads, operate in extreme heat, or drive in dusty or high-load conditions, you should follow the severe-service guidance in your owner’s manual, which generally calls for more frequent service.

Official guidance from Ram

This section outlines the typical intervals recommended by Ram for the 68RFE automatic transmission used in the Ram 2500 diesel, including checking the manual for severe service. Use the actual manual to confirm numbers for your model year. Mopar-supplied Dexron VI fluid is the standard, and changing the filter during a service is usually recommended.

• Normal driving interval: about every 60,000 miles (roughly 96,000 km).


• Severe service and towing: more frequent according to your owner's manual; fleet or dealership advice may suggest as low as 40,000–60,000 miles depending on usage and conditions.

In short, the baseline is roughly 60,000 miles, with shorter intervals if you regularly tow or operate in harsh conditions. Always verify with your manual or dealer.

What drives interval choices

Experts emphasize that several conditions affect how often you should change the transmission fluid. Here’s what to consider as you plan service intervals.

• Towing heavy loads: Additional stress and heat accelerate fluid degradation.


• Ambient temperature and climate: Hot climates or sustained high-load operation raise transmission temperatures.


• Dusty or dirty environments: Dust and particulates can accelerate wear and fluid breakdown.


• Driving style and terrain: Frequent stop-and-go city driving or steep climbs increase fluid cycling and heat.

Understanding these factors helps you tailor the interval to your Ram 2500’s usage rather than relying on miles alone.

How the service is performed

When you service the transmission, most owners opt for a drain-and-fill with a new filter, rather than a full system flush. The goal is to replace the majority of the old fluid while preserving the internal components. Here’s a typical approach.

• Drain the pan fluid and replace with fresh Dexron VI-compatible ATF.


• Replace the transmission filter (and any associated gaskets/seals as recommended by the service manual).


• Refill to the correct level and perform a test drive to verify smooth operation.

Important note on flushing

Some shops offer a system flush, but many technicians caution against flushing high-mileage or heavily used transmissions. A drain-and-fill with a new filter is the standard, lower-risk method for most Ram 2500 applications.

In practice, the drain-and-fill approach is commonly preferred to minimize potential debris disturbance and shifting concerns. Always confirm the method with your technician and ensure compatibility with the 68RFE transmission.

Signs you may need service sooner

Even if you’re not at the standard mileage, certain symptoms can indicate it’s time for a transmission fluid change or additional diagnostics.

• Slipping, rough shifts, or delayed engagement between gears.


• Burnt or strong chemical smell coming from the transmission area.


• Discolored, dark, or gritty fluid on the dipstick.


• Overheating or diagnostic trouble codes related to the transmission.

If you notice these signs, consult a qualified technician to assess fluid condition and overall transmission health.

Practical tips for Ram 2500 owners

Following best practices can help extend transmission life and maintain fluid effectiveness between changes.

• Use Mopar Dexron VI certified transmission fluid or an equivalent that meets Dexron VI specifications.


• Perform a proper drain-and-fill with a new filter rather than a home “flush” unless advised by a professional.


• Keep service records and verify intervals against your model year and towing usage in the owner’s manual.


• If you tow heavily or operate in extreme conditions, consider scheduling service more frequently or consulting a dealer for a severe-service schedule.

Sticking to manufacturer guidance and maintaining records helps protect warranty coverage and keeps the 68RFE transmission performing reliably.

Summary

The Ram 2500 diesel’s automatic transmission fluid change interval is typically about 60,000 miles under normal driving, with more frequent service under severe service such as heavy towing, hot climates, or dusty conditions. Use the owner’s manual as the final authority, and perform a drain-and-fill with Dexron VI-compatible fluid, including replacing the filter. Monitor for signs of trouble and keep thorough maintenance records to ensure long-term reliability.

Does RAM recommend changing transmission fluid?

For RAM vehicles, it is generally recommended to change the fluid every 60,000 to 100,000 miles. However, these intervals can vary based on your vehicle model and the conditions under which you drive. Vehicles frequently used for towing or in harsh driving conditions might require more frequent fluid changes.

What is the service schedule for a RAM 2500 diesel?

A Ram 2500 diesel maintenance schedule requires oil and filter changes every 15,000 miles (or 7,500 for severe use) and fuel filter replacement every 15,000–30,000 miles. Other key intervals include 30,000 miles for rear axle and transfer case fluid services, 60,000 miles for the CCV filter, and 150,000 miles for engine coolant replacement. 
Every 7,500 miles 
Rotate tires, Lubricate U-joints and driveshaft, Inspect front end and CV/universal joints, and Check and refill Diesel Exhaust Fluid (DEF) if needed. 
Every 15,000 miles 
Change oil and filter, Replace engine and chassis-mounted fuel filters, Inspect brake linings, Replace engine air filter, and Replace cabin air filter. 
Every 30,000 miles 
Change front and rear axle fluids, Change transfer case fluid, Adjust parking brake cable, Inspect brake linings and replace as needed, and Inspect CV/universal joints. 
Every 60,000 miles 

• Service automatic transmission fluid and filter (for 6-speed automatic)
• Replace Closed Crankcase Ventilation (CCV) filter
• Replace serpentine belt and conduct EGR cleaning 

Every 100,000 miles 
Flush and replace power steering fluid. 
Every 150,000 miles 
Flush and replace engine coolant and Adjust valve lash clearance.

What is the life expectancy of the transmission in a RAM 2500?

However, trucks often go through a lot of wear and tear. This can lead to transmission problems affecting the life span. On average, the transmission in trucks such as the Ram 1500, 2500, and 3500 last for about 100,000 miles.

What year RAM 2500 6.7 to avoid?

2014 RAM 2500
This is one of the worst RAM 2500 years to avoid due to widespread engine woes. There is a concerning fault with a bolt in the intake plenum of the 6.7L Cummins diesel engines. If the #6 cylinder ingests the bolt, it can loosen and break off, leading to catastrophic engine failure.