Best Engine Oil For 6.7 Cummins

Published on
Best Engine Oil For 6.7 Cummins

Cummins engines have been used in Dodge Trucks for a very long time. With the high horsepower, torque, and towing ability of 6.7L Cummins vehicles comes responsibility for regular maintenance and more frequent oil changes. Buying the right engine oil for Cummins 6.7 engines is not just about getting the best performance out of your engine. It is also about increasing the engine life. To help you choose the right engine oil, we have reviewed some of the best engine oil options you can get on the market today.

Top 5 Best Engine Oils for 6.7 Cummins

1. Valvoline High Mileage Synthetic Blend Motor Oil

Key Features

  • Anti-Wear Additives
  • Premium Seal Conditioners
  • Superior Antioxidants

If you have a Cummins vehicle that has done over 75000 miles, this Valvoline Synthetic Blend Motor Oil is one of the best oil for 6.7 Cummins that will help you step up the fight against engine wear. The strength and efficacy of the oil come from a unique proprietary MaxLife Technology that’s very effective in reducing wear, deposits, and leaks that are typical to high mileage engines.

Furthermore, the formulation features enhanced anti-wear additives that deliver thick layers of film on critical engine parts to prevent auto engine breakdown. Its ability to stop engine leaks and improve overall engine health is another thing that makes it highly recommended.

Premium Seal Conditioners

Seals play an important role in engine protection, as they help retain engine oil and prevent contaminants that could cause damages from entering. However, these seals could deteriorate with extended engine use. Like the Valvoline High Mileage Synthetic Blend Oil, any good high mileage oil contains seal conditioners that restore the seals.

Added Detergents

Also, this Valvoline engine oil features added detergents that improve protection against sludge and deposits. The detergents hold particles that are too small to get caught in the filters, so they don’t get deposited on engine parts. This is an important thing to consider in any best oil for 6.7 Cummins.


  • Great for use in extreme conditions
  • Improved fuel economy
  • It is reasonably priced
  • Improved wear protection
  • Protects internal engine components
  • Advanced soot control


  • The packaging could be better

2. Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil

Key Features

  • One Solution Technology
  • Endorsed by Cummins
  • Advanced Deposit Control

The Valvoline Premium Blue SAE is endorsed and recommended by Cummins as one of the best oil available on the market. However, it is also recommended by other major automobile engine makers as the proper engine oil to keep automobiles going for a long time. 

Another exciting thing about the oil is that it is formulated for high performance in emissions treatment engines. This includes machines that feature modern technologies like exhaust gas recirculation and diesel particulate filters. The 15W-40 viscosity means that it performs really well at high and moderate temperatures.

One Solution Technology

The Valvoline Premium Blue is characterized by a unique One Solution Technology that makes it suitable for use in a wide range of engines, including heavy-duty gas and diesel engines. You can expect it to provide superior wear protection and fuel efficiency in your heavy-duty trucks and equipment.

Outstanding Oxidation Resistance

Quite interestingly, it comes in conventional and synthetic options. Nevertheless, both options offer outstanding oxidation resistance to enable long oil life and low fuel consumption in heavy-duty engines.


  • Good performance at high temperatures
  • Improved fuel economy
  • Suitable for use in a range of heavy-duty engines
  • Protects internal engine components


  • Not tNot the best oil for cold weather

3. Shell Rotella T6 Full Synthetic Engine Oil

Key Features

  • Fully Synthetic Formulation
  • Low Fuel Consumption
  • Best Synthetic Oil for Cummins

The Shell Rotella T6 is a fully synthetic engine oil popularly recommended for Cummins diesel engines operating because of its positive effect on fuel economy. As it is engineered with shear stability, this recommended oil is able to resist viscosity loss and maintain good oil pressure, even in heavy-duty engines.

With a 5W-40 viscosity rating, it offers better cold temperatures flow, and it is perfect for cold starts if you live in a cold region. Another exciting thing about Shell oil is that it is compatible with emission control systems. It comes highly recommended as one of the best oil for 6.7 Cummins.

Triple Protection Plus Technology

Shell shows off its unique Protection Plus Technology that features a special combination of full synthetic oil and advanced additives to increase engine protection, great fuel economy, and extend engine life. The additives are added to make it the right oil to protect against the destructive effect of soot and other contaminants.

Emissions System Compatibility

The Shell Rotella T6 is also an advanced low ash formulation. This gives the oil capacity control the blockage or damage of exhaust after-treatment devices, thereby ensuring vehicle emission compliance and diesel engine fuel economy.


  • Improved fuel economy
  • It is perfect for cold starts
  • Compatible with exhaust emissions control systems
  • Improved deposit control
  • Fully synthetic oil


  • Not the best oil for very high mileage engines

4. Shell Rotella T5 Synthetic Blend Engine Oil

Key Features

  • Synthetic Blend
  • Reduces engine wear
  • Low Ash Formulation

Just like the Rotella T6 we reviewed above, the Shell Rotella T5 Diesel Engine Oil is formulated with the unique Triple Protection Plus Technology that ensures oil capacity to protect against wear, deposits, and oil breakdown in diesel trucks. It is a comparatively versatile formulation that works in Cummins diesel engines, Dodge Ram, lawnmowers, ATVs, and other heavy-duty engines.

While the Rotella T6 is fully synthetic, the Shell Rotella T5 oil is a blend that contains some crude elements. However, the synthetic blend nature takes nothing away from its efficacy as a motor engine oil. It is still a low-emission oil that works well in modern engines and it is one of the most recommended oil for Cummins 6.7 and Dodge Ram.

Improved Oxidation Protection

The Shell Rotella T5 is formulated to deliver an impressive oxidation performance, such that it is able to resist breakdown under high-temperature performance. As it has a viscosity rating of 15W-40, it performs best at moderate and high temperatures.

Exceeds CK-4 Wear Limits

The blend technology of the Shell Rotella T5 exceeds the new CK-4 specifications, with 37% more performance than the maximum wear requirements. This excellent wear protection is why it is one of the best engine oil for 6.7L Cummins engines. It also protects against valve train wear.


  • Increased fuel economy
  • Extended drain capabilities
  • Excellent oil capacity
  • Protection against oil breakdown


  • The threading on the cap is not durable

5. Shell Rotella T4 Triple Protection Conventional Engine Oil

Key Features

  • Enhanced Shear Stability
  • High Engine Functionality
  • Low Ash Formulation

The Shell Rotella T4 engine oil is one of the most advanced Shell Rotella Formulations ever. The 15W-40 motor oil is great at handling extreme temperatures, and it offers a whole lot of other benefits. As it is designed to be used in heavy-duty engines, it is one of the best diesel engine oils for Cummins diesel trucks and Dodge Ram.

Also, it is quite versatile and performs well in both older and new engines alike. Furthermore, viscosity control and optimal oil pressure will be ensured in your engine, thanks to the enhanced shear stability performance of the oil formulation. It also boasts of functional blend performance.

Enhanced Deposit Protection

Like most of the other best diesel oil on our list, the Shell Rotella T4 prevents deposits and contaminants from settling on essential engine parts, thereby keeping the engine cleaner over oil drain intervals.

Protection For All Heavy-Duty Engines

Another exciting highlight of this product is that it is versatile enough for use in virtually all heavy-duty diesel engines. It is a recommended oil for Cummins 6.7 and a wide range of machines. This includes machines that are emission controlled with EGR and those that have Diesel Particulate Fuel Filters


  • Enhanced fuel economy
  • Improved oil consumption
  • Reduction in deposits and contaminants
  • Extended oil drain interval
  • Good quality oil


  • Not the best oil for extreme temperatures

Buying Guide for 6.7 Cummins Engine Oil

Keeping your 6.7 Cummin engine healthy and strong can only be possible when you use appropriate and compatible oil quality. This is why you need to take your time and consider certain factors before making up your mind about particular engine oil options. Well, to make things easier for you, here are the precise details of what you need to look out for when buying an engine oil for Cummins 6.7.

Engine System

First, you need to consider your engine system before looking out for compatible oil. If your Cummins vehicle system burns fuel at high heat and pressures, you should select an oil that would be able to restrict or manage the strain.


Do not forget that your engine would always need a frequent top-up, so it is important you consider an engine oil you can afford and have it available even before your engine needs it. But then, sometimes quality might not mean high-priced. There are quite a number of affordable brands out there that serve almost the same (if not the same) purpose as expensive brands. Nevertheless, if you live largely and can afford one of the high-priced engine oil, why not?

Lubricating Power

After checking for the price, one other thing to check for is efficiency in doing the main job of lubricating. Or what is the essence of fairly-priced engine oil that is unable to keep your 6.7 Cummins diesel engine healthy and strong? You can read up other people’s reviews or the OEM recommendations. Be it affordable or expensive, high quality and value should be the standard.

Environmental Protection

As much as you would want to achieve efficiency with your engine, you might also want to put the safety of the ecosystem into consideration. To reduce air pollution, you should consider 6.7 Cummins engine oil that is specially formulated to prevent or minimize toxic discharge.

Viscosity Rating

If you were using your engine in an extremely hot or extremely cold environment, you would need an engine oil with detergent power, called ‘detergent oil’. You would neither want your oil to thicken too much in cold temperatures nor want it to thin out in hot weather. When your oil is too thin, it won’t work perfectly, and when it is too thick, it won’t run through the engine system. Ensure you choose the oil with the right viscousness.

What Oil Is the Best for Cummins?

There are quite a number of good oils for 6.7 Cummins, but the Valvoline Premium Blue Diesel Engine Oil 15W-40 remains the overall best oil as it works well in all types of regions.

Types of Oil for 6.7 Cummins

There are different oils for 6.7 Cummins on the market, such as:

High-Viscosity Motor Oil

This is a type of oil that is able to restrict shear forces and flows freely. The High-viscosity oil comes slippery, and it lubricates your engine even and quicker than you could imagine. It moves freely through the system and coats the parts evenly as it moves.

High-Mileage Engine Oil

This type of oil works well and is basically the best oil for the older 6.7 Cummins engines operating. It is a mixture of base oil and additives like oxidation preventatives and conditioning agents. All these substances come together to help soften seals and lower fuel consumption. This engine oil is ideal if you have a vehicle with over 75,000 miles or probably 300,000 miles on the odometer.  

Synthetic Diesel Oil

For 6.7 Cummins that undergo combustion on high heat and pressure (like the turbo 2021), synthetic oil is the best diesel oil for handling the strain and resisting the pressure. This type of oil is a powerhouse and ranks the best diesel motor oil for powerful engines that get under stress. Also, this type of oil is man-made, produced from artificial resources.

Conventional Oil

This type of oil for Cummins is refined from crude oil. Conventional oil is basically the oldest as it is derived from natural sources. It ruled the world of engines back in the days until other types of oil were being produced. Also, the issues of damages relating to this oil have made it less common as people now go for an advanced and better oil. But on the bright side, you could get two quarts of this oil with the same amount you would spend on just one quart of synthetic oil.

Detergent Oil

The last but not the least type of oil for Cummins 6.7 is detergent oil. Detergent oil is formulated from base oil but with some additives that make it a top-pick for most users. This oil is pretty much good at maintaining structure and quality under heat and pressure. With this, you would not need to change oil frequently as you would with other oils.

Are Synthetic Motor Oils Better for 6.7 Cummins Engines?

Yes, synthetic oils are better for 6.7 Cummins engines. This is because 6.7 Cummins engines burn fuel at pretty high heats and pressures, and for such powerhouses, engine oil that can handle and withstand such strain is needed, of which synthetic oils are the best oils. They also make for improved fuel economy and low oil consumption.

What Is the Difference Between 5w40 and 15w40?

5W40 is synthetic oil, while 15W40 is mineral-grade oil. 5W40 can work an engine in lower temperatures than 15W40. The ‘W’ stands for lowest winter temperature the oil has a working resistance in.

Why Is My Cummins 6.7 Burning Oil?

Your Cummins might be burning oil for quite a number of reasons. It could be the main seal is leaking, or the filter needs a change. It could also be that the exhaust stream has dirt or residues in it. When this happens, it will ultimately affect the engine running smoothly.

How to Change 6.7 Cummins Engine Oil?

Changing 6.7 Cummins oil is easy peasy if you would follow this guide:

  • First of all, warm your engine to an operating temperature.
  • Insert a drain drive ratchet into the drain plug and loosen.
  • Next is to loosen the filter and spin it off. To avoid spilling oil and making a mess, thread in a filter cap.
  • Clean the oil drain plug
  • Lubricate the new engine filter and fix it.
  • Next is to fix the oil drain plug
  • Fill the engine with the required quarts for your engine.
  • Start the engine and wait for the oil to circulate.
  • Lastly, check the oil level to know if you have filled to the required level or how much oil you need to add

How to Change Oil Pan on 6.7 Cummins?

You can change the oil pan on your 6.7 Cummins even without pulling the engine. Here is how:

  • Firstly, you should loosen the transmission mount.
  • Then with a heavy-duty Jack, jack the motor up a bit. Remove the bolts on the motor mount and jack the motor further up.
  • Ensure you take all the wiring harnesses out of the way and disconnect the batteries too, for safety.
  • Then you drain all the oil, loosen the bolt and gently wriggle the pan out.
  • Next, you clean off the dirt and replace the pan using the same process

Benefits of Oil for 6.7 Cummins

Just like you need food to keep on going without breaking down, the 6.7 Cummins also needs to be “fed” to keep being super-efficient. Here are some of the benefits you get from oiling your engine.

Keep your engine strong

If you want your 6.7 Cummins to stay with you for long years and be in a pretty good state after long years, then you sure need to keep it dripping with oil – now, not any kind of oil but the right one. This helps to prevent friction from the parts grinding against one another as they move. The oil keeps your Cummins 6.7 lubricated and free from buildups that can affect the engine. Your engine sure needs oil for super-efficient performances and fuel efficiency.

Prevents rust

With diesel oil, your 6.7 is able to survive havoc that would have been caused by combustion. Combustion is the burning of fuel, and according to research, it is said that your fuel could have about five percent water in it. The result of having water touch the internal parts of your engine is rust and wear. But with oil, a hydrophobic barrier is put up to prevent this damage.

Keeps environments safe 

Your 6.7 Cummins gets better combustion results when it has diesel oil. Instead of releasing carbon monoxide, which is dangerous to humans and animals’ health, your engine would give a purer burn, resulting in water and carbon dioxide. With this, the ecosystem would be safe, and your engine would not get clogged up with soot that has built up.


Is Valvoline premium good motor oil for 6.7 Cummins engines?

Yes, Valvoline premium is pretty good motor oil for 6.7 Cummins. This oil keeps your engine in a good state and improves performance.

What’s the exact 6.7 Cummins oil change cost?

Cummins 6.7 oil costs anything between $12 to $78. However, this price is not static as it varies based on brand and oil types. The oil change cost will also include the cost of getting a professional to do the oil change.

What’s the best oil filter for Ram 1500 or 6.7 Cummins?

The best oils filter for Cummins 6.7 is the Fleetguard LF16035 Stratapore Oil Filter. It is durable and filters effectively.

Do I Need to Change the Oil Filter Too With My Oil?

Yes, you should change the filter anytime you change the oil.


One cannot rule out the importance of engine oil in increasing the performance and shelf life of diesel engines, especially for 6.7 Cummins. Choosing the right engine oil for your 6.7 Cummins will go a long way in ensuring fuel economy and the best engine performance possible. Not only will it maximize engine performance, but it also increases diesel engines lifespan ensuring advanced soot control by protecting against the rapid wear and deterioration of important engine components. But having lots of oils to select from can be pretty strenuous and confusing. That’s why we have chosen the best options from the best oil brands. Whether you live in hot or extremely cold temperatures, this article has got all you need to know about diesel oil for Cummins and how to choose one functional best oil for Cummins 6.7.

Leave a Comment