Best Oil for Cummins 6.7 in 2023 – Top 8 Reviewed

The Cummins 6.7, dates back to 2007, and it’s known as the most popular engine option for Dodge RAM 3500 and 2500. It’s an exceptionally powerful engine that offers impressive torque and incredible horsepower. To make sure that your 6.7 Cummins continues to perform optimally, you need to change its oil regularly.

However, it can be daunting to choose the best oil for your 6.7 Cummins because of the abundance of products available in the market. That’s where this guide comes into place. Here, we’ll discuss the 8 best oils for 6.7 Cummins, their key features, and their pros and cons. It’ll help you make an informed decision about what’s right for you.

What is Cummins 6.7L? The Cummins 6.7L is a turbocharged inline six-cylinder engine. It was specially designed for people who need high horsepower but also want a fuel-efficient machine. It has been widely used in heavy-duty trucks, such as Dodge RAM 3500 and 2500, as well as commercial vehicles. 

Which oil should you use for Cummins 6.7 Engine?

You’ll need to answer the following questions to determine which oil you should use for your Cummins 6.7 Engine.

• • How often do you drive your vehicle?

• • What type of engine oil is available in your location?

• • What is your budget?

Other than these questions, your buying decision should also depend on the mileage of your vehicle, as well as, how high the quality of oil you want to use. 

Bear in mind that higher quality oils don’t always mean more expensive. There are many oils for 6.7 Cummins, but not all of them are created equal.

Best Oil for Cummins 6.7 – Our Top Picks

Best Overall

Editor's Choice

Runner's Up

Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA, Case of 3

CUMMINS NW Cummins 3265336 Onan SAE 15W-40 Oil - 1 Quart

Shell Rotella T6 Full Synthetic 15W-40 Motor Oil, 1 Gallon (3 Pack)

Brand

Valvoline

Cummins

Shell Rotella

Viscosity

15W-40

15w-40

15w-40

Vehicle Service Type

Truck

Truck

Motorcycle, Car, Truck

Liquid Volume

3 Gallons

32 Fluid Ounces

384 Fluid Ounces

Check Price

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Check Price

Best Overall

Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA, Case of 3

Brand

Valvoline

Viscosity

15W-40

Vehicle Service Type

Truck

Liquid Volume

3 Gallons

Check Price

Editor's Choice

CUMMINS NW Cummins 3265336 Onan SAE 15W-40 Oil - 1 Quart

Brand

Cummins

Viscosity

15w-40

Vehicle Service Type

Truck

Liquid Volume

32 Fluid Ounces

Check Price

Runner's Up

Shell Rotella T6 Full Synthetic 15W-40 Motor Oil, 1 Gallon (3 Pack)

Brand

Shell Rotella

Viscosity

15w-40

Vehicle Service Type

Motorcycle, Car, Truck

Liquid Volume

384 Fluid Ounces

Check Price

Last update on 2024-12-03 / Affiliate links / Images from Amazon Product Advertising API

The following is our list of the best oils for 6.7 Cummins that we have selected after researching, testing, and reading real-world customer reviews. So, let’s have a look in detail below. 

1. Valvoline Premium Blue SAE

Key Features

• • The ONLY ONE engine oil recommended by Cummins

• • Exceptional oxidation and viscosity control

• • Unique formula for enhanced performance

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The Valvoline Premium Blue SAE diesel engine oil is the best Engine Oil for a 6.7 Cummins because of multiple reasons. The biggest reason that makes it the best option is that it’s the only product recommended by Cummins itself. 

 

 

If you want to keep your engine running smoothly, you can’t go wrong with this engine oil. It has been designed to provide long-term protection and performance, so you can rest assured knowing that it’s going to be there when you need some help. 

 

 

It uses the latest one–solution Technology which is a patent-pending innovation of the company and it can be used in any vehicle, regardless of fuel type. This diversification makes it an ideal product for both diesel and gasoline engines alike. 

 

 

However, its popularity continues amongst owners who use natural gas tanks as well because this converter also works on them too. It was designed with a dodge Cummins 6.7 engine and it provides superior protection against wear while also preventing soot from clogging up your engine’s internals. 

 

 

If you want something safe but effective then reach for Valvoline Premium Blue SAE.

 

 

It’s a synthetic blend oil approved and recommended by Cummins Inc. It comes in a one-gallon jug to help you add it to the engine conveniently. Plus, you can also order a five-gallon pail as well.

Pros

2. Cummins Onan SAE 15W-40 Oil

 

Key Features

• • High-Quality oil at an affordable price

• • Made up of premium materials

• • Made to match your requirements

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The Cummins Onan SAE 15W-40 oil is one of the best oils for 6.7 Cummins engines. It is the perfect option for your 6.7 Cummins diesel engine and will provide the maximum protection your engine needs to last as long as possible. 

 

 

This oil, apart from being certified by SAE standards and overall better-quality oil than mineral oils, is feasible as compared to many alternatives out there. 

 

It reduces fuel usage while also offering protection against corrosion which saves money when compared to other synthetic or conventional oils. 

 

 

The Cummins Onan SAE 15W-40 Oil provides maximum engine protection from wear and tear by providing an extended life cycle with increased performance potential. It also helps avoid routine maintenance costs, such as frequent filter changes to increase fuel efficiency. 

 

 

 

This product provides maximum protection against dirt build-up while also ensuring optimal performance with all makes/models.

 

3. Quaker State Motor Oil

Key Features

• • Advanced Durable oil

• • Exceeds latest oil standards for protection under high temperature

• • Three times better than the wear standards set by American manufacturers

 

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Quaker State Motor Oil is an excellent choice for a 6.7 Cummins oil capacity. It’s compatible with the engine and provides optimal performance in both wet and dry conditions. 

 

 

It’s a solid choice for diesel engines that need durable wear protection and reduced engine overhauls.

 

 

It’s made of the company’s 10W-40 blend and also includes other additives to ensure increased efficiency in today’s petroleum-based fuels. 

 

 

Another great feature of this product is that it provides great corrosion protection against harmful acids generated by engine contaminants. 

 

 

Quakers State motor oil is more than just a typical engine lubricant. It contains comprehensive filtration properties that can withstand high temperatures. It makes this oil an ideal option for prolonged use in vehicles with higher operating speeds or severe weather conditions like hot sun and cold winters. 

 

 

Better yet, it maintains viscosity from start to finish, providing optimal protection against wear and tear on engines. You can use it in vehicles that you use for daily commuting between high-speed highway operation and repetitive stop-and-turn driving. 

 

 

Quaker State motor oil is the best choice to maintain engines in good working condition. It has been formulated with advanced particle technology that prevents deposits and sludge, which can sabotage engine operation. 

 

 

To ensure the longevity of your vehicle, this motor oil is made with high-quality ingredients and has a long-lasting lifespan. 

 

 

Quaker State Advanced Durability 10W-40 is designed specifically to keep the vehicles running smoothly despite all circumstances over time.

 

4. Shell Rotella T6 Full Synthetic 15W-40

Key Features

• • Delivers improved oxidation performance

• • Meets diesel engine requirements of Cummins

• • Extended drain capability

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The Shell Rotella T6 Full Synthetic 15W-40 diesel engine oil can be your best choice if you’re looking to protect your vehicle from all types of threats and problems. 

 

 

It’s based on Shell’s triple anti-corrosion technology that reduces metal particles on contact as well as prevents sludge build-up in coolant systems. It also helps the engine improve fuel efficiency by reducing thickening at cold temperature starts or idling. 

 

 

This means less pollution caused by harmful discharged gasses like carbon dioxide which can be released when burning fossil fuels instead of gas-based ones. It’ll help you get the most out of every mile by working optimally in all weather conditions. 

 

 

If you have a tough and powerful truck like RAM 3500 and you want to ensure heavy-duty engine wear protection, you can go with this high-performance motor oil. 

 

 

It is the best oil for Dodge Cummins 6.7 diesel engine, and it’s capable of providing up to 1.5% better fuel economy without sacrificing protection or durability. 

 

 

The Shell Rotella T6 Full Synthetic 15W-40 contains a new type of dispersant additive that provides enhanced levels of protection against soot, dirt, and other contaminants. 

 

 

Plus, it has optimized shear stability to improve viscosity control and optimal engine oil pressure, which reduced the risk of cavitation on cold start-up. 

 

Zero emissions and minimal particulate with the help of a specially formulated ash-less binder, this engine not only cleans but also protects your vehicle’s catalytic converters from getting damaged. 

 

5. Shell Rotella T6 Full Synthetic 5W-40

Key Features

• • Enhanced fuel economy

• • Improved heat resistance

• • Outstanding shear stability

 

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When it comes to the best engine oil for your 6.7 Cummins, Shell Rotella T6 Full Synthetic 5W-40 is a great option because of its high quality and long-lasting efficiency.

 

 

You can find this product in the owner’s manuals of most vehicles as a recommended manufacturer-grade motor oil. That’s because it offers excellent performance at an affordable price tag. 

 

 

The best way to protect your engine and keep it running smoothly is by using synthetic oil that’s tailored specifically for you.

 

 

The Triple Protection Plus formula of this engine oil can provide up to 1.5% better fuel economy. 

 

 

It’s formulated with modern additive technology that protects against the effects of soot, dirt, and other contaminants, to improve the engine’s longevity. 

 

 

It is engineered to maintain optimal engine oil pressure; the synthetic motor oils in this product are specially formulated with shear stability and viscosity loss resistance. 

 

 

The Shell Rotella T6 Full Synthetic 5W-40 will keep all components of your engine running smoothly and efficiently. 

 

 

It works as a diesel oil for all diesel-powered vehicles, from tractors to classic vehicles and heavy-duty pickups. 

 

6. Schaeffer OTR Plus Full Synthetic Diesel Engine Oil

Key Features

• • Maintains fuel economy

• • Make the engine durable

• • Superior soot busting

• • Resists corrosive and abrasive wear

 

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The Schaeffer OTR Plus Full Synthetic Diesel Engine Oil offers impressive performance for enhanced engine power and improved life. It’s known as one of the best diesel engine oils that you can use for your 6.7 Cummins. 

 

 

One of the best features of this product is that it maintains fuel efficiency, which can save you a considerable amount of money in the long run. Additionally, it offers excellent wear resistance as well to prevent damage and protect the engine. 

 

 

As the name implies, the Schaeffer OTR Plus Full Synthetic Diesel Engine Oil is made of 100% synthetic materials, making it more stable than conventional diesel-based engine oils. 

 

 

It’s a non-corrosive product, which helps in maintaining engine durability. We liked the superior cold weather stability and operating characteristics of this oil, thanks to its unique formulation. 

 

 

As compared to most conventional engine oils, this product offers better soot-busting properties. It helps you clean the engine filters conveniently, even during extended periods of extreme cold conditions. 

 

 

The company has added high-performance additives to the oil to prevent carbon buildup, which can cause damage to engine components. It also reduces oil consumption and minimizes the ash content of the oil. 

 

 

The Schaeffer OTR Plus Full Synthetic Diesel Engine Oil flaunts a specialized blend of Micron Moly and Penetro technology. It prevents metal-to-metal contact between the cylinder liner and piston ring, resulting in fewer engine wear issues. 

 

 

The oil also comes with the company’s unique additive system, containing anti-wear and anti-foaming agents to prevent sludge and varnish formation. 

 

 

Lastly, it’s a non-toxic, environmentally friendly product, making it a great option for Cummins 6.7L engines. 

 

 

Pros

7. Mobil 1 Advanced Full Synthetic Motor Oil

: 

 

 

 

 

Key Features

• • Provide low-speed pre-ignition (LSPI)
  • Offers timing chain wear protection
  • Improves your fuel economy
  • Helps prevent sludge and deposits

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Mobil 1 Advanced Full Synthetic Motor Oil is another excellent product that makes for one of the best options for 6.7 Cummins engines. It comes with a specialized formulation that protects 6.7 Cummins engines during extreme operating conditions. 

 

 

It uses Mobil 1’s signature Triple Action Formula which is specially formulated to provide engine lubrication and protection against wear and tear. Not only does it ensure engine protection to keep your truck in good condition but it also offers superior fuel economy. 

 

 

This high-quality motor oil has a very thick viscosity which ensures that the oil never separates even under extremely high operating temperatures. It contains anti-wear additives to reduce friction and extend the life of your engine. 

 

 

Additionally, it delivers exceptional 10X better internal engine heat protection and outstanding low-temperature protection than the industry standard. The low-temperature protection it offers can extend up to 500 degrees Fahrenheit, which is perfect for the extreme heat of summer. 

 

 

The LSPI (Low-Speed Pre-Ignition) protection prevents engine knock and oil breakdown, which in turn helps you maintain better fuel economy. 

 

 

It also provides improved wear protection for your timing chain, which is a must-have to ensure the longevity of the engine. It helps in preventing the accumulation of sludge and deposits that might lead to oil starvation. 

 

 

Overall, if you are looking for a dependable and efficient oil, you can go with the Mobil 1 Advanced Full synthetic motor oil. It is compatible with all 6.7 Cummins engines and it is highly recommended by our experts. 

8. Castrol Synthetic Motor Oil

Key Features

• • Offers strength under extreme pressure

• • Anti-wear and deposit control protection formula

• • Features fluid titanium technology

• • 3X stronger against viscosity breakdown

 

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Castrol Synthetic Motor Oil is a premium motor oil that you can use with diesel engines. It’s made of a blended mixture of two different oils that are specially formulated to protect your vehicle’s engine during extreme pressures. 

 

 

The oil itself has a unique viscosity that allows the oil to flow easily in all conditions. It can maintain the correct viscosity level even under extremely high temperatures. 

 

 

The Castrol Synthetic Motor Oil contains different compounds that reduce metal-to-metal contact when the engine is under extreme conditions. It’s a durable product that also reduces sludge deposits and improves lubrication on various parts of the engine. 

 

 

With its advanced technology, this oil provides high levels of protection against wear and tear and protects the engine for the entire drain interval. 

 

 

If you are looking for something that improves performance, reduces fuel consumption, decreases engine deposits, and increases fuel economy, you can go with this engine oil. We also loved its anti-wear and deposit control properties that help prevent the build-up of sludge and protect the engine from damage. 

 

 

One of the best features of this synthetic motor oil is that it features fluid titanium technology. It increases the strength of the engine against viscosity breakdown and reduces engine wear and tear. 

 

 

Overall, it’s an excellent choice for a 6.7 Cummins that not only ensures engine protection but also offers a great balance of performance and fuel economy. 

 

Buying Guide for Choosing the Best oil for 6.7 Cummins

It is important to change your oil regularly and use a high-quality filter. Otherwise, debris accumulating in your engine will stay there and cause problems down the line. 

If you’re planning to buy engine oil for your vehicle, you’ll need to keep certain factors in mind to choose the most suitable product. Use this guide to make an informed decision about which type of oil is right for you. 

Viscosity 

The 6.7 Cummins engine is tough and can take a lot of hard work, but it needs the right oil to keep running smoothly. 

There are tons of engine oils available in the market that you can use for this engine, making it difficult to choose the best product. Considering the viscosity of the engine oil will help you in making the right buying decision. 

It’s one of the most important factors to consider when you’re choosing oil because it affects how well the oil flows in cold weather or with high heat conditions. 

Before buying oil for your 6.7 Cummins, check the viscosity to make sure it is within the recommended range of 5w30-40. 

With increased pressure and temperature, you will need thicker oil such as 10w30 or 15w50 that can withstand these conditions. 

The thicker oils also offer better protection against engine wear and corrosion than thinner oils do. 

Additives 

What additives work well for the best oil for 6.7 Cummins? In the world of diesel engines, lubrication is critically important for efficient engine performance. 

Engine oils that keep your vehicle running smoothly and safely have plenty of additives in them to help with different things such as corrosion prevention and anti-wear protection. 

Some of the best conventional oils are patented with multi-additive formulas that contain antioxidants, corrosion inhibitors, pour point depressants, and friction modifiers. 

It can be difficult to find a product combining all additives under one roof but it’s not impossible. The best approach is to identify your engine-specific needs for improving performance or reducing wear. 

Then, you can start looking for engine oil, tailored specifically, just for what you need, like offering improved fuel efficiency and a longer engine life span. 

Oil Chemistry 

Oil chemistry is an important consideration when buying the best oil for your 6.7 Cummins engine. Bear in mind that the composition of an engine is much more than just gasoline or diesel. 

There are several types, each with its benefits and drawbacks that manufacturers need to take into account when designing a car’s system for getting power from fuels to ensure all components work optimally. 

Different oils work better with certain engines and fuel types than others and it leads to less wear on blades over time. Using oil with chemistry that works well with your vehicle’s engine will reduce carbon build-up. Not only will it prevent rusting but it’ll also improve the engine performance and efficiency. 

6.7% synthetic oil is an excellent choice for modern engines, providing a high level of performance and engine longevity. It also offers better fuel efficiency with its blend containing no contamination from organic oils like other blends on the market today. 

Price 

Price is one of those factors that you must consider while buying any type of product, including engine oil. You want to buy a good-quality product without breaking the bank. 

While most premium-quality engine oils have a higher price tag, you can find lower-priced oils that work just as well. Keep an eye on sale items that can help you save a considerable amount of money. 

Brand Reputation 

With the oil that protects your Dodge Ram truck’s engine and helps it continue operating as it should for a long time, it is wise to buy from brands you know and trust. 

Renowned brand names have a good reputation because they offer high-quality engine oils. Buying their products ensures quality assurance with peace of mind knowing there won’t be any regrets. 

It’s important to note that if you use a poor-quality product from an unknown brand, it will lead to different types of performance problems. These issues might not show up until hours/days after adding the oil to the engine.

However, they’ll appear eventually and will cost you a whole lot of money on expensive repairs. Therefore, instead of trying to save a few bucks, consider buying a high-quality product from a trusted brand to protect your vehicles. It can also help you save money in the long run. 

Manufacturer Recommendations 

These days, the best Cummins oil for your truck’s engine is one that will be matched its needs. Check your user’s manual to find out manufacturer recommendations. 

Engine specs are important to get right. There is a certain type of oil, designed for your engine and recommended by the manufacturer, based on tests and analysis. 

That’s why you should always follow these recommendations to make sure that you choose the best engine oil for your vehicle. 

Lubricating Power 

It depends on the application and usage of your engine. The idea behind the oil is to lubricate parts, reduce friction, and keep moving components from overheating within the engine. 

The wrong type of oil can often lead to degradation and inefficient performance, which can also lead to expensive repairs. There is a range of different oils specifically designed for use in diesel engines. 

The oil you put into your Cummins engine must perform its function effectively. So, you should always try to use ‘recommended’ or ‘specified’ engine oils. 

Types of Oil for 6.7 Cummins 

There are a few different types of oil that are best for 6.7 Cummins engines. these types include the following: 

Synthetic Oil 

Synthetic oil, as the name suggests, is a type of engine oil that is made from synthetic materials. Synthetic oils are specially designed to offer better performance and durability than traditional engine oils. They are also less likely to clog your vehicle’s engine and can improve fuel economy. 

Conventional Oil 

Conventional oil is a type of engine oil that is made from crude oil. Most oils of this type are thick, viscous liquids and they are used in engines to lubricate and protect the moving parts. 

Conventional oil has been around for many years and is still the most common type of engine oil used today. 

Detergent Oil 

Most detergent oils contain different types of additives and for this reason, they have got this name. Cleansing and neutralizing impurities that cause deposits or sludge in an automobile or motorcycle engine are what these detergents do. 

High-Mileage Engine Oil 

High-Mileage engine oils are created to perform better during high-mileage use. These oils perform better under extreme temperatures and high loads. They can prevent high wear and tear and make for a perfect option for vehicles that are used for long drives. 

High-Viscosity Motor Oil 

High-viscosity motor oil is a type of engine oil that is designed to provide better performance and longevity than regular engine oils. Added: They’re made from special compounds and additives that are very thick. This makes them resistant to breaking down in cold weather or under high pressure. 

They also have a high flash point, which means they will not vaporize at high temperatures. This makes high-viscosity motor oils a good choice for engines that run at high temperatures, such as those used in heavy-duty trucks and commercial vehicles. 

Lastly, they also offer better fuel economy because the engine can run at a lower RPM. 

FAQs About Best Oil for 6.7 Cummins 

How Often Should You Change Oil in A 6.7 Cummins? 

Oil changes are a great way to reduce costs on your car. Change the oil every 15,000 miles if you want but be sure and check with warranty service before doing so.

The frequency depends on a variety of factors, like how old and dirty you think it is. Follow the official maintenance schedule to avoid costly repairs and prolong engine life. 

Are Our Synthetic Oils Better for 6.7 Cummins Engines? 

Oil choice is a very personal issue. Synthetics are typically said to be better, while some prefer blends and others still will not use any type at all. That’s because they think it doesn’t make sense how often engines need an oil change or if there are different types of oils for each temperature range needed in vehicles.

What’s the Difference between 5w40 and 15w40? 

5W-40 engine oil is formulated with the viscosity of 5-weight oil at low temperatures. This is an important point to understand because most people prefer their vehicle engines to warm up without trouble in cold climates.

15W-40 engine oil is typically formulated with the viscosity of 15-weight oil, but some are thicker than others. What matters for this type of lubricant are things like mixing performance, rust prevention, and shear stability at high temperatures/high pressure. 

Tom Harris

My name is Tom Harris, founder of this blog. I’m a mechanical engineer with 20 years of experience in the automotive industry. I’m here to help you with your vehicle’s problems, easy fixes and share my insights and experience so that you can enjoy your rides more.