5.9 Cummins Transmission Fluid Capacity: A Guide for Optimal Performance

5.9 Cummins Transmission Fluid Capacity: What You Need to Know

If you’re the proud owner of a 5.9 Cummins engine, you know that proper maintenance is key to keeping it running smoothly. One important aspect of maintenance is ensuring that your transmission fluid is at the right level. In this article, we’ll delve into the transmission fluid capacity for the 5.9 Cummins engine, so you can keep your truck performing at its best.

Transmission Fluid Capacity and Type

To ensure optimal performance and longevity of your 5.9 Cummins engine, it’s crucial to use the right amount and type of transmission fluid. Here’s a handy table that outlines the transmission fluid capacity in both quarts and liters:

Transmission Fluid Capacity Quarts Liters
Manual Transmission 4.5 4.3
Automatic Transmission 17 16.1

It’s important to note that these values are approximate and may vary slightly depending on the specific model and year of your 5.9 Cummins engine. Always consult your owner’s manual or a trusted mechanic for the most accurate information.

How to Check and Fill Transmission Fluid

Now that you know the transmission fluid capacity, let’s go over the steps to check and fill it:

  1. Ensure that your vehicle is parked on a level surface and the engine is turned off.
  2. Locate the transmission fluid dipstick. It is usually labeled and can be found near the back of the engine compartment.
  3. Remove the dipstick and wipe it clean with a lint-free cloth or paper towel.
  4. Reinsert the dipstick fully and then remove it again to check the fluid level. The dipstick will have markings indicating the minimum and maximum levels. The fluid level should be within this range.
  5. If the fluid level is low, carefully add the appropriate type of transmission fluid using a funnel. Be sure to add it in small increments and recheck the level each time to avoid overfilling.
  6. Once the fluid level is at the correct range, securely reinsert the dipstick and ensure it is properly seated.

Remember, safety is paramount when working with any vehicle. If you’re unsure or uncomfortable performing these steps, it’s best to consult a professional mechanic.


Maintaining the proper transmission fluid level in your 5.9 Cummins engine is essential for its overall performance and longevity. By following the recommended fluid capacity and using the appropriate type of transmission fluid, you can ensure that your truck continues to run smoothly mile after mile. Remember to consult your owner’s manual or a trusted mechanic for specific information related to your vehicle’s make and model. Happy trucking!

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