The Cummins 6.7L Turbo Diesel is the most powerful engine option out there. It is a premium heavy-duty engine and to maintain its quality, it requires the best products and regular maintenance.

The Cummins 6.7 can function well under a lot of oils, however, to figure out which oil will suit your vehicle the best and maximize its performance, I have put together a detailed guide to help you understand the crucial factors and mentioned the advantage and the negatives of each product.

7 Best Oil for 6.7 Cummins Engine Reviewed

All the products mentioned below are certified by the American Petroleum Institute.

Valvoline 15W-40 Diesel Engine Oil

Key Details:

  • Manufacturer: Valvoline
  • Style: Premium Blue
  • Viscosity: 15W-40
  • Liquid Volume: 3 Gallons

PROS
  • Improved oxidization protection
  • Superior wear protection
  • Great value for money
  • Recommended for Cummins Inc.
CONS
  • Poor packaging material, may spill

The Valvoline Premium Blue 15W-40 Diesel Engine oil has one solution technology that works well for a range of heavy-duty engines including the Cummins 6.7 engine. The product is recommended by Cummins Inc. which speaks for the quality itself.

It significantly reduces the problems of the engine and ensures improved performance. It is expertly engineered to deliver improved performance and protection in all types of diesel engines. Valvoline Premium Blue has been tested by Cummins in various engines and provides unmatched quality. A major disadvantage of the product is that it may break open during transit.

The product is approved and meets the requirements of API SN, SM, and CK-4, CJ-4, CI-4 Plus, CI-4, CH-4. There are hardly any better products available on the market for your 6.7 Cummins engine.

It is one of the best products to pick up for your vehicle.

Valvoline 5W-40 Diesel Engine Oil

Key Details:

  • Manufacturer: Valvoline
  • Style: Premium Blue Extreme
  • Viscosity: 5W-40
  • Liquid Volume: 12 Quarts

PROS
  • Premium quality lubricant
  • Superior synthetic base stocks
  • Improved fuel economy
  • Enables up to 60,000 miles 
CONS
  • Expensive price tag

The Valvoline Premium Blue Extreme 5W-40 Full Synthetic Diesel Engine Oil is an improved version of the product above.

It not only has most of the crucial features that make the Premium Blue Oil a highly recommended oil, but it also delivers an extended and enhanced service, improves the fuel economy, delivers astounding retention of the viscosity, and excellent performance under all weather conditions.

The hi-performance synthetic technology meets the demands of modern diesel engines. It is equipped with superior synthetic base stocks which provide your engine with a faster and safer start under extreme weather conditions. The product also reduces the carbon build-up in the engine which reduces the life of the engine and causes residual noise in the engine.

The product, due to being extremely efficient in what it does, costs higher than some of the other products on this list.

The product is recommended by Cummins Inc. after rigorous testing and is licensed for API services CK-4, CJ-4/SN, CI-4 Plus, CI-4, CH-4.

Shell Rotella T4 10W-30 Diesel Engine Oil

Key Details:

  • Manufacturer: Shell Rotella
  • Style: New Formulation Conventional Oil
  • Viscosity: 10W-30
  • Liquid Volume: 128 Fluid Ounces

PROS
  • Enhanced deposit prevention
  • Maximizes engine life
  • Affordable price
  • Advanced low-ash formulation
CONS
  • Not fully synthetic oil

The Shell Rotella T4 Triple Protection Conventional Oil is an extremely good engine oil for the Cummins 6.7 engine. Since it is conventional oil, and not fully synthetic oil, the price of the same is extremely affordable however it does not have all the features of the full synthetic oil and thus oil changes will be more frequent.

If one is okay with that, then the product works well in the Cummins 6.7 engine to provide a stable performance. It is specially formulated for enhanced deposit protection which keeps the engine cleaner over prolonged oil drain intervals.

It is equipped with an advanced low-ash formulation that helps in controlling the blockage in the engine which causes excessive oil burning and increases the stress on the engine. It also provides enhanced stability performance which helps in controlling the viscosity helps in maintaining optimal oil pressure in the engine.

Moreover, it maximizes engine life by thoroughly oiling the important parts of the engine like the pistons which result in smooth functioning of the engine. The T4 uses advanced additive technology to protect the engine under severe engine conditions and prolong its life.

Even though this product might seem like an excellent choice, it is important to remember that this product is not a full synthetic oil thus will require more oil changes.

The product meets the API Service CK-4, CJ-4, CI-4 Plus, CI-4, CH-4 requirements and meets the performance requirements of ACEA E9.

Amsoil 15W-40 Diesel and Marine Motor Oil

Key Details:

  • Manufacturer: Amsoil
  • Style: Heavy Duty
  • Viscosity: 15W-40
  • Liquid Volume: 1 Quart

PROS
  • Heavy Duty Oil
  • Extended Drain Intervals
  • Reduces Oil Emissions
  • Reduces Engine Wear
CONS
  • Increased Oil Burning

AMSOIL Synthetic Heavy-Duty Diesel & Marine Motor Oil is a premium diesel oil that provides enhanced performance for your engine. It is expertly engineered with heavy-duty additives which reduces the deposits and wear in the engine. It also neutralizes acids, reduces corrosion in the Cummins 6.7 engine.

The product extends drain intervals. It is designed for on-road diesel engines. It has lower volatility than conventional petroleum oils and almost outperforms all the other full synthetic oil types in the market.

The oil consumption and emissions are minimized and the product has low volatility that helps the engine retain its viscosity after prolonged usage.

One major drawback of the product is that the rate of oil burning is much more significantly faster than compared to other products on this list.

The product meets the API Service API CI-4+, CI-4, CH-4, CF, CF-2, SL, SJ; ACEA A3/B3, E2, E3, E5, E7 and works well in the Cummins 6.7 engine.

Triax Fleet Supreme 10W-30 Full Synthetic

Key Details:

  • Manufacturer: Triax
  • Style: Ultimate Full Synthetic
  • Viscosity: 10W-30
  • Liquid Volume: 4x (1 Gallon)

PROS
  • Friction modified and pre-boosted VI stabilizer
  • 25,000-mile drain interval
  • State-of-the-art dispersal and ash control systems
  • Moly plating technology – 60% lower wear
CONS
  • May result in oil leaks

The Triax Fleet Supreme ESP Ultimate Full Synthetic Oil is a  new generation of engine oils equipped with friction reduction technology that is designed to suit a wider variety of engines with an affordable price tag. 

The products of the same exceed OEM requirements and are equipped with emission control systems and offer backward compatibility with some of the older models. The product is made with moly plating technology for superior wear protection and oxidation.

It also provides high-temperature stability as compared to the other products out there. It has a VI stabilizer pre-boosted, has unrivaled turbo-charged protection that will reduce the creation of deposits in the engine.

It also contains state-of-the-art dispersal control systems to prevent the engine from depositing excess dirt on its surface. The product provides a highly lubricated oil which provides better engine performance by reducing the chances of wear in the engine.

The only major problem with this product is the container of the product is made of poorer plastic material as compared to the other products on the list and may result in leaks.

It is certified by API CK-4, CJ-4, CI-4 Plus, CI-4, CH-4, and meets the ACEA E9-12 requirements.

Shell Rotella T6 5W-40 Diesel Engine Oil

Key Details:

  • Manufacturer: Shell Rotella
  • Model: T6
  • Style: Full Synthetic
  • Viscosity: 5W-40
  • Liquid Volume: 128 Fluid Ounces

PROS
  • Improved Fuel Economy
  • Formulated with additive technology
  • Prevents viscosity loss
  • Emission System Compatibility
CONS
  • Increased engine noise

The Shell Rotella T6 Full Synthetic 5W-40 features a Triple Protection Plus technology, formulated with fully synthetic base oils.  It provides better fuel economy for the engine.

The product is specially engineered with additive technology which prevents the depositing of dirt and deposits in the engine. This full synthetic heavy-duty engine oil saves money by reducing the overall fuel consumption in the vehicle, without deteriorating the protection or durability of the engine.

It also provides improved wear performance for the 6.7 Cummins heavy-duty engine and provides an increased level of protection. The product is equipped with a low-ash formulation that helps in controlling the excessive deposits in the engine which reduces its life.

It improves the pickup of the engine under extreme temperatures and provides an easier and smoother driving experience. The product reduces the loss of viscosity and aids in maintaining optimal pressure.

This product perfectly matches the needs of the Cummins 6.7 engine as it is the perfect mixture of having the recommended viscosity and an amazingly affordable price tag. The only drawback for the same would be that using this oil may increase the noises in the engine 

It is certified and meets the API CK-4, CJ-4, CI-4 PLUS, CI-4, CH-4, ACEA E9 requirements.

Shell Rotella T6 15W-40 Diesel Engine Oil

Key Details:

  • Manufacturer: Shell Rotella
  • Model: T6
  • Style: Full Synthetic
  • Viscosity: 15W-40
  • Liquid Volume: 128 Fluid Ounces

PROS
  • Improved Fuel Economy
  • Triple Protection Plus formula
  • Prevents viscosity loss
  • Emission System Compatibility
CONS
  • Increased engine noise
  • Costly product

The Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil features Triple Protection Plus technology which prevents wear and deposits in the engine. The product is equipped with additive technology that provides a smoother pick-up under extremely cold temperatures.

It is perfectly suitable for the Cummins 6.7 engine and is one of the decent alternatives for the Valvoline products. The product is a full synthetic oil which means it will provide a better performance as compared to the conventional or synthetic oil blends.

The product reaches the important parts in the engine faster in colder temperatures. Thus, it also minimizes the wear in the engine. The product has added detergents which improve the life of the engine which is an added bonus.

It is important to understand that even though the viscosity of the product is higher, it might be a better alternative if your vehicle has a problem and requires more oil changes under a shorter distance. However, the drawback of the 15W-40 viscosity is that the engine may not work as well under colder conditions.

It meets the API Service CK-4, CJ-4, CI-4 Plus, CI-4, CH-4 ACEA E9 requirements.

Oil Buying Guide For Cummins 6.7

Before purchasing any product for your vehicle, you will need to analyze certain things.

1. Understanding the Viscosity

The viscosity of the engine dictates how thin or thick the oil will be according to the temperature. Thinner oils have better oil flow and the thicker oils keep the engine parts well lubricated for a longer period. The viscosity depends upon the winter grade mentioned in the manufacturing guide of the vehicle and it varies from product to product.  The Cummins 6.7 engine recommends and performs the best under the 5W-40 oil. However, other viscosity can also keep the engine healthy. Other viscosity oils may not provide the best performance in the vehicle, so it is recommended to use the 5W-40 oil type.

2. Choosing the best oil

There are 3 major types of oils available in the market. The conventional oil, synthetic blend oil, and the full synthetic oil. The Cummins 6.7 is a heavy engine, therefore can work with either a conventional oil type or a full synthetic or synthetically blended oil. The recommended oil type is the Full Synthetic type as it is able to keep the engine functioning well over long periods and the intervals between oil changes are longer. The Conventional or Synthetic Blend oils can work in the engine, however, using the wrong engine type may result in poorer vehicle performance and may increase stress on the engine. However, it is important to remember that the full synthetic oils cost more than their other counterparts.

3. Engine Performance

The engine performance of the vehicle is the most important factor one needs to know. It all depends on the usage one does of it and thus to understand how much pressure the engine will go through. If you are a person who uses the vehicle on a daily basis with long-distance and improper roads, you should go for the heavily lubricated thick engine oil. Similarly, if you live in extreme cold weather and face the problem of poor pickup, then a thinner oil may be the way to go. It is important to realize that every vehicle undergoes different treatments and one needs to make an informed decision accordingly.

4. Additional Features

The additional features can be of crucial importance if one is confused between certain products. It helps in understanding exactly what you need your engine oil to do and makes it easier to identify what specific problems you need to be tackled in the engine.

How to put Engine Oil in your Cummins 6.7 Engine?

Frequently Asked Questions

The Valvoline Premium Blue Extreme 5W-40 Diesel Engine is the best oil type for the vehicle. However, the Valvoline Premium Blue 15W-40 Diesel Engine also works well.

The recommended distance is around 5,000-7,500 miles for the full synthetic oil. However, conventional oil needs changing every 3,000 miles.

The idea oil pressure is 30 psi at idle, 50 psi anywhere above 1000 rpm.

It is recommended to use the Full Synthetic Oil type. However, it also functions well under synthetic blend or conventional oil types.

The vehicle is fully compatible with biodiesel blends up to 5% biodiesel meeting ASTM specification D-975.

Our Verdict

The Cummins 6.7 is an extremely premium quality diesel engine and uses the Full Synthetic 5W-40 motor oil. However, there can be exceptions in terms of the viscosity or changing the full synthetic oil to synthetic blend or conventional oil but will result in reduced engine performance and frequent oil changes over lower distances. The Valvoline Premium Blue Extreme 5W-40 Diesel Engine or the Valvoline Premium Blue 15W-40 Diesel Engine work best.

However, if your vehicle has developed a certain type of problem which causes it to not be suitable to the Valvoline oil types, the next best alternatives would be the Shell Rotella T6. Both of the models of the Shell Rotella T6 would work well in the engine and provide you with an excellent driving experience. Ultimately, the decision depends upon the user and what they are looking for from their vehicle. 

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