Oil Capacity Of 6.7 Cummins Engine | Best Change Interval

Attention all 6.7 Cummins engine owners! Are you ready to elevate your engine’s performance and longevity? Dive into the world of optimal oil maintenance, where understanding your engine’s oil capacity and best change intervals can be the game-changer. Discover how to keep your powerful engine purring like a kitten with these expert tips and tricks!

How Much Oil Does A 6.7 Cummins Take?

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The oil capacity of a 6.7 Cummins engine varies depending on its model year. Engines produced after 2010 require 12 quarts or 3 gallons (11.35L) of oil. Older models of the 6.7 Cummins may have a different oil capacity, with some requiring less than 12 quarts and others needing more.

The oil requirement for your 6.7 Cummins engine may also vary depending on whether you change the oil filter. If you don’t change the filter, the capacity will be around 10 quarts (9.5L). However, it is recommended to change the filter along with the oil to maintain the cleanliness and longevity of the engine.

It’s important to note that even though the stated oil capacity is 12 quarts for post-2010 models, your vehicle may need slightly less. Overfilling the engine with oil can increase pressure and cause wear and tear on the oil pump and other parts, so it’s best not to exceed the specified amount.

When selecting oil for your 6.7 Cummins engine, consider the type and quantity of oil to ensure optimal performance and longevity of your truck.

What is the recommended oil change interval for a 6.7 Cummins engine?

To prevent the buildup of sludge and oil dilution in your 6.7 Cummins engine, it is essential to adhere to the recommended oil change intervals. These intervals vary depending on the model year of your engine and can also be influenced by factors such as driving conditions and style.

For 6.7 Cummins engines manufactured between 2007 and 2012, it is recommended to change the oil every 7,500 miles or six months, whichever comes first. For models made after 2013, the recommended oil change interval is every 15,000 miles, six months, or 500 hours of use, whichever comes first.

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3 Best Oils for 6.7 Cummins

The following are the three best Oils for your 6.7 Cummins engine:

#1 Quaker State 10W40 Protective Oil

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The 6.7 Cummins engine requires oil that can withstand challenging conditions, and the Quaker State 10W40 Protective Oil is a great choice. This oil contains potent additives that help prevent engine wear and tear. It is specially formulated for engines with over 75,000 miles on the odometer.

These older engines consume more oil than newer ones due to increased demand or cracked seals. The Quaker State oil has conditioning additives that can treat the seals and prevent leaks, keeping the engine running smoothly.

It also includes additional additives to reduce adjustment friction and slow oil consumption. This oil is robust and reliable, helping to extend the engine’s life and improve its performance.

#2 Cummins Onan 15W40 Oil

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To cut down on expenses related to vehicle maintenance, the Cummins Onan 15W40 Oil is an excellent option. It is budget-friendly and doesn’t compromise on quality, making it a valuable investment. This oil has a universal compatibility rating, which means it can work well with existing oil and eliminates the risk of interaction issues.

It is designed to work specifically with Cummins systems and can efficiently limit oil consumption. In warm temperatures, where viscosity tends to increase rapidly, the friction regulators added as additives prevent this from affecting lubrication. Additionally, this oil addresses oxidation damage, making the engine more reliable.

#3 Mobil 1 Turbo Diesel Truck Oil

Source: Amazon

If you live in an area that experiences more snowstorms than heatwaves, the Mobil 1 Turbo Diesel Truck Oil is an excellent choice for your 6.7 Cummins engine. This oil is unique due to its modern technology and advanced additives that provide excellent protection for your vehicle. It is designed specifically for engines with impressive horsepowers, such as the 6.7 Cummins.

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This oil reduces oil loss and improves fuel economy, which helps to enhance the overall performance of your vehicle. It is also compatible with any type of oil on the market, making it ideal for modern vehicles.

If your vehicle is equipped with Exhaust Gas Recirculation, which is designed to reduce emissions, this oil is particularly useful. The eco-friendly features in the engine impact heat and oxidation, and it’s essential to use an oil that can handle these demands.

How To Change Oil On A 6.7 Cummins Engine

Here are the step-by-step instructions for changing the oil on a 6.7 Cummins engine:

  • Gather the necessary tools and supplies. You will need a socket set, an oil filter wrench, an oil drain pan, a funnel, a new oil filter, and the appropriate amount and type of oil for your engine.
  • Park the vehicle on a level surface and turn off the engine. Make sure the engine is cool to the touch before proceeding.
  • Locate the oil drain plug on the underside of the engine. Place the oil drain pan directly underneath the drain plug.
  • Use a socket set to loosen the drain plug and allow the old oil to drain out completely. This may take a few minutes.
  • Once the old oil has drained out, replace the drain plug and tighten it securely.
  • Locate the oil filter on the engine. Use an oil filter wrench to remove the old oil filter.
  • Use a clean rag to clean the area where the oil filter attaches to the engine.
  • Apply a small amount of fresh oil to the rubber gasket on the new oil filter.
  • Install the new oil filter by hand, making sure the rubber gasket is in contact with the engine.
  • Use the oil filter wrench to tighten the oil filter securely.
  • Locate the oil filler cap on the top of the engine. Remove the cap.
  • Use a funnel to add the appropriate amount and type of oil to the engine. Refer to your owner’s manual for the correct type and amount of oil for your engine.
  • Once the oil has been added, replace the oil filler cap.
  • Start the engine and let it run for a few minutes to circulate the new oil.
  • Check the oil level using the dipstick. Add more oil if necessary.
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Can I overfill the oil in my 6.7 Cummins engine?

Overfilling the oil in a 6.7 Cummins engine can cause damage to the engine and potentially lead to engine failure. Maintaining the correct oil level and not exceeding the maximum fill mark on the dipstick is important.

How do I check the oil level in my 6.7 Cummins engine?

To check the oil level in a 6.7 Cummins engine, park the vehicle on a level surface and let the engine cool for at least 10 minutes. Remove the oil dipstick, wipe it clean with a cloth, and reinsert it into the engine. Remove the dipstick again and check the oil level against the markings on the dipstick.

Can I change the oil filter without changing the oil in my 6.7 Cummins engine?

Changing the oil filter without changing the oil in a 6.7 Cummins engine is not recommended. The oil filter can become saturated with contaminants and potentially release them back into the fresh oil, reducing its effectiveness and potentially causing damage to the engine.


In conclusion, the oil capacity of a 6.7 Cummins engine can vary depending on the year and model of the engine. Overfilling the engine can cause severe damage to the engine, and checking the oil level regularly is essential.

Changing the oil filter without changing the oil is not recommended, as it can potentially harm the engine. Maintaining the correct oil level and performing regular oil changes with the recommended amount of oil can help ensure the longevity and proper functioning of the 6.7 Cummins engine.

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