If you own a Dodge or Ram truck with a Cummins engine, you know how important it is to keep up with routine maintenance. One detail that often gets overlooked is the power steering fluid.
The recommended Dodge Cummins power steering fluid type is Mopar ATF+4 (MS-9602 spec). Some older models may use Mopar Power Steering Fluid (MS-5931). Always check your Dodge Ram Cummins manual to ensure the correct fluid type.
In this guide, we’ll break down which power steering fluid each generation of Dodge Cummins requires, why it matters, and how to keep your system in top shape.
Why Power Steering Fluid Matters in Dodge Cummins
Power steering fluid isn’t just a lubricant. It’s a hydraulic medium that transfers pressure throughout the system, helping you turn the wheel with minimal effort. In heavy-duty trucks like the Ram 2500 and 3500 with Cummins engines, the fluid has to work even harder due to towing loads, oversized tires, and frequent steering demands.
Using the wrong fluid can create several problems:
- Foaming and noise: Incompatible fluids aerate more easily, leading to whining sounds when you turn the wheel.
- Seal damage: Some fluids contain additives that swell or shrink rubber seals, causing leaks.
- Pump wear: Without the right viscosity and additives, the pump can overheat or fail prematurely.
For Cummins-powered trucks that are often relied on for work and heavy hauling, these issues can quickly become expensive headaches.
Dodge Cummins Power Steering Fluid by Year
The correct fluid depends heavily on the truck’s generation. Below is a breakdown by model year.
| Model Year / Engine | Recommended Fluid Type | Notes |
| 2019–2025 Ram 2500/3500 (6.7L Cummins) | ATF+4 (Mopar MS9602 spec) | Commonly listed in OEM catalogs; widely available. |
| 2007.5–2018 Ram 2500/3500 (6.7L Cummins) | ATF+4 | Compatible with factory systems; some owners note Mopar-branded fluids give quieter operation. |
| 2004.5–2007 Dodge Ram (5.9L Cummins) | ATF+4 or Mopar Power Steering Fluid | Some parts suppliers list both; check manual to avoid mixing. |
| 1990s–2002 Dodge Ram (5.9L Cummins) | Mopar Power Steering Fluid (MS5931 spec) | ATF not always recommended; MS5931 is the factory spec. |
Mopar Specifications Explained
Mopar has published different specs for different systems over the years. Understanding them helps avoid confusion:
- ATF+4 (MS9602): Originally designed as transmission fluid, but widely approved for power steering systems in late-model Dodge and Ram trucks. It’s synthetic, resists foaming, and is backward-compatible with many older systems.
- Power Steering Fluid (MS5931): A dedicated hydraulic fluid used in earlier trucks. It has a different additive package than ATF. Substituting ATF+4 in these older systems can cause noise or pump issues.
When in doubt, check your owner’s manual or look for a label on the reservoir cap. Many Cummins trucks clearly state “Use ATF+4” or “Use Power Steering Fluid Only.”
ATF vs. Power Steering Fluid: The Debate
Among Ram owners, few topics stir as much debate as whether ATF can replace power steering fluid.
- Pro-ATF Camp: Many owners report running ATF+4 for years without issues, especially in late-model trucks. Mopar themselves lists ATF+4 as the approved fluid for most 2007.5 and newer Cummins trucks.
- Pro-PSF Camp: Others argue that dedicated power steering fluid (MS5931) is better suited for the system, especially in older models. They point out that ATF contains friction modifiers designed for transmissions, which aren’t necessary in steering systems.
The truth is, both sides are correct—depending on the year. Modern Cummins trucks are engineered to run on ATF+4, while earlier models were not. Mixing the two is where problems arise.
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How to Check and Change Power Steering Fluid
Keeping the right fluid in the system is only half the battle; you also need to maintain it properly.
Checking Fluid Levels
- Park the truck on a level surface.
- With the engine warm, open the hood and locate the power steering reservoir.
- Pull the dipstick (built into the reservoir cap on most models).
- Ensure the fluid is between the “Hot” and “Cold” marks, depending on engine temperature.
Inspecting Fluid Condition
- Healthy fluid: Bright red (ATF+4) or clear amber (PSF).
- Bad fluid: Dark, foamy, or smells burnt.
Changing the Fluid
- Jack up the front wheels so they can turn freely.
- Use a turkey baster or fluid extractor to remove old fluid from the reservoir.
- Refill with the correct Mopar-spec fluid.
- Turn the wheel lock-to-lock several times to circulate.
- Repeat until the fluid remains clean.
2018 Dodge Cummins Power Steering Fluid Type
The 2018 Dodge Ram Cummins 6.7L uses Mopar ATF+4 fluid (MS-9602 spec) for the power steering system.
This fluid protects the pump, prevents noise, and keeps steering smooth. Always avoid mixing other fluids unless the entire system is flushed properly.
2017 Dodge Cummins Power Steering Fluid Type
For the 2017 Dodge Ram Cummins diesel, the correct fluid is Mopar ATF+4 (MS-9602). It’s designed for heavy-duty use, works well under towing stress, and helps avoid steering pump wear. Check levels regularly and top off only with approved ATF+4 fluid.
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2016 Dodge Cummins Power Steering Fluid Type
The 2016 Dodge Cummins requires Mopar ATF+4 fluid, which meets MS-9602 specifications. It resists heat, foaming, and wear, keeping the steering system strong for hauling or daily driving. Use only ATF+4 to ensure performance and avoid damaging hoses or seals.
2014 Dodge Cummins Power Steering Fluid Type
In 2014 Dodge Ram Cummins trucks, Mopar ATF+4 (MS-9602) is the recommended power steering fluid. It supports reliable steering in tough conditions and extends pump life. Don’t substitute with generic fluids, as they may cause leaks, steering noise, or long-term damage.
2012 Dodge Cummins Power Steering Fluid Type
For the 2012 Dodge Cummins diesel, the safe choice is Mopar ATF+4 (MS-9602). This fluid provides excellent lubrication and keeps steering easy, even under load.
Stick with Mopar-approved ATF+4 to protect seals, prevent pump failures, and maintain smooth daily steering control.
2007 Dodge Cummins Power Steering Fluid Type
The 2007 Dodge Ram Cummins may use Mopar Power Steering Fluid (MS-5931) or ATF+4, depending on the system.
Many owners prefer ATF+4 for reliability. Always check the owner’s manual or reservoir cap label to confirm the right fluid before topping up.
2009 Dodge Cummins Power Steering Fluid Type
The 2009 Dodge Cummins steering system is designed for Mopar ATF+4 (MS-9602). This synthetic fluid resists breakdown and keeps steering responsive.
Avoid mixing other brands or types of fluid, since doing so could lead to steering noise, pump strain, or leaks.
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2013 Dodge Cummins Power Steering Fluid Type
The 2013 Dodge Ram Cummins runs best with Mopar ATF+4 (MS-9602 spec). It helps maintain consistent steering performance, especially during towing or heavy-duty driving. Use only ATF+4 when topping off or flushing to avoid premature steering component wear and costly repairs.
ATF or Power Steering Fluid
Most Dodge Cummins trucks after 2007 use ATF+4, while older models often require Mopar Power Steering Fluid.
Always check your owner’s manual or reservoir cap before topping off. Using the wrong type may cause noise or pump issues.
Power Steering Fluid Type?
The right power steering fluid depends on your truck’s year. Newer Dodge Ram Cummins models use Mopar ATF+4, while older trucks may need Mopar Power Steering Fluid (MS5931). Sticking to the correct spec ensures smooth steering and protects components.
Dodge Ram 2500 Power Steering Fluids
For Dodge Ram 2500 trucks, the recommended fluid is usually Mopar ATF+4. Some older 5.9 Cummins models may need Mopar Power Steering Fluid.
Always confirm with the manual. Using the correct fluid avoids leaks, steering whine, and premature pump wear.
Power Steering Fluid For 2019–2024 Ram 2500/3500
The 2019–2024 Ram 2500 and 3500 Cummins models require Mopar ATF+4 fluid (MS-9602 spec). This synthetic fluid handles towing stress, prevents foaming, and keeps steering smooth. Never substitute with generic fluids—stick to ATF+4 to protect seals, hoses, and pumps.
2007 Dodge Ram 2500 5.9 – What Type of Power Steering Fluid Does It Take?
The 2007 Dodge Ram 2500 with the 5.9 Cummins may need Mopar Power Steering Fluid (MS5931) or ATF+4, depending on build. Check the reservoir cap or owner’s manual. Using the wrong type could lead to leaks, noise, or steering damage.
Does My Dodge Ram Have ATF or PSF in It?
It depends on the year. Most Rams from 2008 and newer use ATF+4, while older Cummins models often used Mopar Power Steering Fluid. Look at the cap or manual for exact guidance. Never assume—using the wrong fluid can damage components.
Can I Mix Mopar Power Steering Fluid 4 With ATF+4?
Mixing Mopar Power Steering Fluid and ATF+4 isn’t recommended. They have different additives and can cause foaming or seal wear.
If switching, flush the entire system first. Always stick with one type for consistent performance and steering reliability.
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Which Power Steering Fluid?
Most Dodge Cummins trucks use ATF+4 or Mopar Power Steering Fluid +4. These fluids protect the pump, work well in hot and cold weather, and match factory requirements. Always check your truck’s manual or reservoir cap to be sure.
Power Steering Fluid Swap
When swapping power steering fluid, remove as much old fluid as possible and refill with fresh ATF+4 or Mopar PSF+4.
Don’t mix random fluids. Turning the wheel lock-to-lock helps cycle out old fluid and smooth the steering feel.
Mopar Steering Fluid Or Atf4?
Most Cummins trucks accept either Mopar Power Steering Fluid +4 or ATF+4, because both meet the same Chrysler specification.
If your cap or manual mentions ATF+4, you can safely use either option without harming your steering system.
Confused About Atf In Power Steering
It’s normal to feel confused. Many Dodge trucks are designed to use ATF+4 as power steering fluid, even though it’s transmission fluid. The system is built for it, so it works safely. Just make sure the bottle says ATF+4 or MS-9602.
Dodge Power Steering Fluid Confusion
Dodge manuals and reservoir caps vary by year, causing confusion. The simple rule: most Cummins trucks use ATF+4, or Mopar PSF+4, which meets the same spec. Avoid universal fluids unless they clearly say they’re approved for ATF+4 systems.
Atf+4 For Power Steering Fluid?
Yes—many Dodge Ram Cummins trucks are designed to use ATF+4 in the power steering system. It handles heat well and protects the pump. Only use real ATF+4, not generic red fluid. It must meet the MS-9602 Chrysler standard.
Power Steering Fluid For 2019–2024 Ram 2500/3500
Most late-model Ram 2500/3500 Cummins trucks use Mopar PSF+4 or ATF+4. Newer manuals often list PSF+4 first, but both are safe if they follow MS-9602. Avoid mixing with universal fluids. Always check your cap or owner’s manual.
Does My 07 5.9 Truck Take Atf4 For Power Steering Fluid?
Yes, most 2007 Cummins trucks use ATF+4 for the power steering system. Many came from the factory with ATF+4 listed on the cap. It gives smooth steering, better cold flow, and strong protection for heavy-duty diesel use.
Can I Mix Mopar Power Steering Fluid 4 With Atf 4?
Yes, you can mix them because both Mopar PSF+4 and ATF+4 meet the same MS-9602 spec. Still, it’s best to stick with one type for long-term use, and avoid mixing with any non-approved steering fluids.
Atf4 Suitable For 01 Cummins Power Steering?
Yes, ATF+4 is suitable for a 2001 Cummins power steering system. Many owners use it without issues, and later guidance supports using ATF+4. It flows well, protects the pump, and is easy to find in US parts stores.
What Power Steering Fluid To Use For A Diesel Engine?
Diesel engines don’t need special steering fluid. What matters is your truck’s spec. Most diesel Rams with Cummins use ATF+4 or Mopar PSF+4. Use whichever your manual recommends, because steering systems differ by year, not engine type.
FAQs
What kind of power steering fluid does a Dodge Ram 3500 take?
Most Dodge Ram 3500 Cummins models use Mopar ATF+4, but older versions may require Mopar Power Steering Fluid. Always confirm by year.
Should you use ATF4 transmission fluid for Dodge power steering?
Yes, most modern Dodge trucks recommend Mopar ATF+4 for power steering. It protects pumps and ensures smooth steering performance under load.
What kind of power steering fluid does a 2004 Dodge Ram 2500 take?
A 2004 Dodge Ram 2500 Cummins typically uses Mopar Power Steering Fluid (MS5931), though some owners safely use ATF+4 after flushing.
What kind of power steering fluid does a 2012 Dodge Ram 2500 take?
The 2012 Dodge Ram 2500 Cummins uses Mopar ATF+4 (MS-9602 spec). It resists heat, prevents foaming, and maintains reliable steering control.
Is Mopar power steering fluid ATF?
No, Mopar Power Steering Fluid (MS5931) is different from ATF. However, Mopar ATF+4 is factory-approved as steering fluid in newer trucks.
What kind of power steering fluid does a 2001 Dodge Ram 2500 take?
The 2001 Dodge Ram 2500 Cummins typically requires Mopar Power Steering Fluid (MS5931). ATF isn’t usually recommended for this model.
Does it matter what type of power steering fluid I use?
Yes, using the wrong fluid may cause leaks, steering noise, or pump wear. Always use Mopar-approved fluid for your truck’s year.
What color is Dodge power steering fluid?
Dodge trucks using ATF+4 have red fluid, while older Mopar Power Steering Fluid appears clear or amber. Dark fluid means replacement.
Conclusion
Power steering fluid may not be the first thing that comes to mind when maintaining a Dodge Cummins, but it plays a critical role in keeping your truck safe, smooth, and reliable. The correct fluid depends on the year: most newer Cummins trucks require Mopar ATF+4 (MS-9602), while older models may call for Mopar Power Steering Fluid (MS-5931). Using the wrong type—or mixing fluids—can lead to leaks, noise, and even costly pump or steering system failures.
The safest approach is always to check your owner’s manual or the reservoir cap for the exact specification. By sticking with Mopar-approved fluids and servicing your system regularly, you’ll keep your Ram 2500 or 3500 steering effortlessly, whether it’s hauling heavy loads, towing, or just handling daily drives.
Your Cummins-powered Ram is built for hard work—give it the right steering fluid, and it will keep performing like the powerhouse it was designed to be.