How Much Oil Does a 6.7 Cummins Take? (Oil Capacity)

Written by

Charles Bolte


Vernon Hoppe 

How Much Oil Does a 6.7 Cummins Take

The 6.7 Cummins engine is distinguished and is highly reliable for its durability and performance. It’s preferred in heavy-duty trucks and other vehicles, especially the Dodge Ram lineup.

If you own a Dodge Ram 2500 or RAM 3500 with a 6.7 Cummins engine, you may wonder, “How much oil does a 6.7 Cummins take?”

Approximately 12 quarts of oil for 6.7 Cummins is necessary with a filter change, and around 11 quarts without a filter change.

In gallons, this is roughly 3 gallons of oil with a filter and 2.75 gallons without one.

6.7 Cummins Oil Capacity

Factors affecting the precise oil capacity include the type of oil filter you use, the design of the oil pan, and any aftermarket modifications, such as oil coolers or extended oil pans.

Understanding these factors is vital for accurate oil measurements.

1. Fluid types


The Cummins engine is prone to wear and tear. To prolong its life, make sure to use the appropriate kind of oil in doing repairs or maintenance.

Depending on driving temperatures, the two types of oil are the 15W-40 for above zero degrees and the 5W‐40 for below zero degrees temperature.

2. Oil Requirements

How much oil for 6.7 Cummins depends on several factors such as the model of your vehicle. Newer models may not always require less compared to an old model. To avoid overfilling or underfilling your engine, check the specifications on the owner’s manual or consult a qualified mechanic to ensure you have the correct requirements.

With Filters

The Cummins 6.7-liter diesel engine capacity with filter is 12 quarts or 3 gallons. Keep in mind that the oil filter holds about a quart of oil. When performing a oil change, add 12 quarts of fresh oil and replace the oil in the filter.

Without Filters

The 6.7-liter Cummins actual capacity without filters is 11 quarts or 2.75 gallons.

Factors Affecting Oil Capacity

Here are different factors affecting oil capacity.

Oil Filters


Different oil filters may hold varying amounts of oil within them. When you change the oil with a new filter, the oil filter itself holds a volume of oil. Therefore, using a larger or smaller filter can affect the total oil capacity required to fill the engine adequately.

Oil Pans


Some oil pans are larger or have different shapes, affecting how much oil they can hold. The shape of the oil pan may also impact the engine’s oil distribution, affecting the total amount required for proper lubrication.

Oil Coolers


Oil coolers typically contain a certain volume of oil within their systems. When you change the oil, it’s essential to account for the oil in these components to ensure your engine receives the correct amount of lubrication.

Recommended Oil for 6.7 Cummins

The right oil is crucial for your 6.7 Cummins engine’s longevity and performance. Here are some key considerations:

Synthetic vs. Conventional Oil


Many experts recommend synthetic oil for 6.7 Cummins engines due to its superior protection and longevity compared to conventional oil.

Synthetic oil also maintains its viscosity better in extreme temperatures. This resilience ensures your engine stays lubricated in harsh conditions, reducing wear and tear.

If you’ve been using conventional oil in your 6.7 Cummins engine and are considering switching to synthetic oil, it’s generally safe to transition. When switching to synthetic oil, it’s crucial to drain the old oil entirely and replace it with synthetic oil. Mixing synthetic and conventional oils can diminish the benefits of synthetic oil.

Oil Viscosity and its importance


The viscosity of your chosen oil is vital. Most dodge Cummins 6.7 engines perform optimally, with oils having viscosities such as 5W-40 or 15W-40.

These viscosity grades balance cold-start protection and high-temperature stability, ensuring your engine runs smoothly year-round.

Recommended Brands

Oil comes in a variety of brands, but not all of them are equally trustworthy and dependable. Some brands can be inferior or contain additives that could damage your engine.


Highly regarded oil brands for Dodge 6.7 oil include:

  • Mobil 1
  • Shell Rotella
  • Valvoline

These brands formulate their oils for diesel engines, offering robust protection and performance.

Choosing the Right Oil

  • Consider your driving conditions, climate, vehicle age, and mileage. If you frequently tow heavy loads or haul cargo, your engine experiences increased stress that may lead to engine wear. Choose a robust oil with adequate lubrication.
  • Engines with higher mileage tend to have accumulated more wear over time. Using an oil designed for high-mileage engines can help rejuvenate seals, reduce oil consumption, and maintain engine performance.
  • Additionally, considering diesel oil capacity is necessary for maintaining optimal engine performance. Monitoring your transmission fluid capacity is crucial for the overall health of your Dodge Ram 2500 or 3500.


How much oil does a 6.7 cummins take? This is an essential question that car owners need to know, as maintaining the correct oil level in your 6.7 Cummins engine is fundamental for its performance. Choosing the right oil type, viscosity, and brand ensures your engine remains well-lubricated and protected against wear and tear.

Always consult your owner’s manual and consider the factors affecting your engine’s oil capacity. Following these guidelines will keep your Cummins engine running smoothly, delivering the power and reliability you expect from this acclaimed diesel engine in your Dodge Ram 2500 or 3500.

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