8 Best Oils for 6.7 Cummins in 2022

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If you’ve ever had to change the oil in your car, then you know that it can be a hassle. But there’s one type of engine oil that might just make your life easier: 6.7 Cummins Engine Oil.

The best oil for your 6.7 Cummins is the one that will keep it running smoothly and efficiently for as long as possible.

What is 6.7 Cummins?

This 6.7 Cummins turbocharged inline six-cylinder engine was created to power those who need high horsepower but also want a fuel-efficient machine.

It has been widely used in heavy-duty trucks as well as commercial vehicles.

Which oil should you use for Cummins 6.7 Engine?

The answer depends on several factors, including:

How often do you drive your vehicle -What type of engine oil is available in your location and within your budget.

In this article, we’ll cover some of the most popular options to help you make an informed decision about what’s right for you.

Everything you need to know including why it’s so important, some different brands, pros & cons, etc.

If you have a 6.7 Cummins engine, then it would depend on the mileage of your vehicle as well as how high the quality of oil you want to use.

Remember 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.

Picking the best oil for your 6.7 Cummins can be a daunting task, but it doesn’t have to be.

Best Oil for 6.7 Cummins-Our Top Picks

Best Overall
Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA, Case of 3
Editor's Choice
Cummins 3265336 Onan SAE 15W-40 Oil - 1 Quart
Runner's Up
Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil (1-Gallon, Case of...
Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA, Case of 3
Cummins 3265336 Onan SAE 15W-40 Oil - 1 Quart
Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil (1-Gallon, Case of...
Shell Rotella
Vehicle Service Type
Motorcycle, Car, Truck
Liquid Volume
3 Gallons
32 Fluid Ounces
384 Fluid Ounces
1,074 Reviews
758 Reviews
5,030 Reviews
Best Overall
Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA, Case of 3
Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA, Case of 3
Vehicle Service Type
Liquid Volume
3 Gallons
1,074 Reviews
Editor's Choice
Cummins 3265336 Onan SAE 15W-40 Oil - 1 Quart
Cummins 3265336 Onan SAE 15W-40 Oil - 1 Quart
Vehicle Service Type
Liquid Volume
32 Fluid Ounces
758 Reviews
Runner's Up
Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil (1-Gallon, Case of...
Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil (1-Gallon, Case of...
Shell Rotella
Vehicle Service Type
Motorcycle, Car, Truck
Liquid Volume
384 Fluid Ounces
5,030 Reviews

Last update on 2022-06-27 / Affiliate links / Images from Amazon Product Advertising API

We took it upon ourselves to find out and listed all the best oils for cummings. So, let’s have a look in detail below.

1. Valvoline Premium Blue SAE

Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil

Key Features

  • The ONLY ONE engine oil recommended by Cummins
  • Exceptional oxidation and viscosity control
  • Unique formula for enhanced performance

Valvoline Premium Blue Diesel Engine Oil is a superior choice for those looking to keep their engines running smoothly.

This is the best Engine Oil for a 6.7 Cummins engine. This oil 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.

This uses one solution Technology which is a patent-pending innovation that can be used in any car, 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.

One best oil for dodge Cummins 6.7 that was designed with engines in mind has been shown through various tests to provide 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.

Valvoline is the synthetic blend oil approved and recommended by Cummins Inc. It comes in a one-gallon jug for convenient use on your own, or you can order five gallons pail of it as well.


  • It stays clean for a longer time
  • Compatible with gasoline and natural gas engines
  • It has very high heat and high oxidation resistance
  • It maintains its thickness
  • Compatible with industry standards


  • Slightly Pricey
  • It May is not suitable for a cold weather

2. Cummins Onan SAE 15W-40 Oil

Cummins 3265336 Onan SAE 15W

Key Features

  • High-Quality oil at an affordable price
  • Made up of premium materials
  • Made to match your requirements

The Cummins Onan SAE 15W-40 oil is one of the best oils for 6.7 Cummins engines, but what exactly makes it so great?

It is the perfect oil for your 6.7 Cummins diesel engine and will provide the maximum protection your engine needs to last as long as possible.

Cummins has always been at the forefront when it comes to innovation, and this is because they’re not afraid of trying new things.

Maintaining a strong history of making diverse products means Cummins will never stop surprising us with what’s next.

This oil apart from being certified by SAE standards and overall better quality oil than mineral oils you can easily get on your market 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 synthetic variety 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 like filter changes while increasing fuel efficiency as well.

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


  • Synthetic for optimal performance.
  • Designed to provide superior protection against wear, oxidation, and corrosion.
  • The best oil for RV, generators, and engines.
  • Engineered to exceed your expectations of durability and protection


3. Quaker State Motor Oil

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

Quaker State Motor Oil is a good choice for 6.7 Cummins oil capacity, as it is to be compatible with the engine and provides optimal performance in wet or dry conditions.

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

The company’s 10W-40 conventional blend provides this, while also including other additives to help with increased efficiency in today’s petroleum-based fuels.

This Oil has been proven to provide the best corrosion protection against harmful acids generated by engine contaminants.

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

It maintains viscosity from start to finish, providing optimal protection against wear and tear on engines that survive daily commutes between high-speed highway operation and repetitive stop-and-turn Necky driving.

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

Oil’s ergonomic design for handling and pouring makes it the best oil choice on your 6.7 Cummins engine with one 5-quart bottle in convenient upright storage.

To ensure the longevity of your vehicle, you must use motor oil made with high-quality ingredients and have a long-lasting lifespan.

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


  • This oil is specially formulated to protect your car’s engine.
  • It keeps rust, corrosion, and wear away from vital parts of your vehicle.
  • Helps extend engine life
  • Engineered to meet the toughest standards
  • API-certified motor oil


  • Good for vehicles that work at higher temperatures.

4. Shell Rotella T6 Full Synthetic 15W-40

Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil

Key Features

  • Delivers improved oxidation performance
  • Meets diesel engine requirements of Cummins
  • Extended drain capability

The Shell-brand full synthetic 15W-40 diesel engine oil is the perfect solution if you’re looking to protect your vehicle from all the threats.

It has triple anti-corrosion technology that reduces metal particles on contact as well as prevents sludge build-up in coolant systems while improving fuel efficiency by reducing thickening at cold temperature starts or idling.

This means less pollution caused by harmful discharged gases like carbon dioxide which can be released when burning fossil fuels instead of gas-based ones.

It will help you get the most out of every mile by keeping its maximum efficiency in all weather conditions.

Heavy-duty engine wear protection for those who drive the toughest trucks and tractors

To provide you with long life.

With the latest technology, this new high-performance motor oil will help you get your car’s maximum potential out on the road.

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

A new type of dispersant additive has been developed to provide enhanced levels of protection against soot, dirt, and other contaminants.

A new type of dispersant additive has been developed in it to provide enhanced levels of protection against soot, dirt, and other contaminants.

Optimized shear stability to improve viscosity control and optimal engine oil pressure, reducing the risk of cavitation on cold start-up.

Zero emissions and minimal particulate with the help of a specially formulated ash-less binder, this product not only cleans but protects your car’s catalytic converters from harm.


  • Great Viscosity and flow in cold weather
  • Affordable
  • Meets API specifications and standards
  • Prevents oil oxidation
  • Maintains optimal engine oil pressure


  • It May is not easily available in some market

5. Shell Rotella T6 Full Synthetic 5W-40

Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil

Key Features

  • Better Fuel Economy
  • Improved heat resistance
  • Outstanding shear stability

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

You can find this in any vehicle owner’s manual as recommended manufacturer-grade motor oil that will provide you with an excellent performance from now until next time.

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 provides 1-5% better fuel economy, compared with SAE 15W-40 oils.

This innovative product is formulated with additive technology that protects against the effects of soot, dirt, and other contaminants. It will leave your car like new again.

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.

This high-quality product will keep all components running smoothly and efficiently.

It is suitable for all diesel-powered vehicles, from tractors to classic cars and heavy-duty pickups.


  • Meets API specifications and standard
  • Fully synthetic oil
  • Great low-temperature flow and viscosity
  • Low emission and maintenance
  • Prevents any breakdown
  • Keeps the engine clean and reliable


  • Not suitable for geared motors

6. Schaeffer OTR Plus Full Synthetic Diesel Engine Oil

Schaeffer Manufacturing

Key Features

  • Maintains fuel economy
  • Make engine durable
  • superior soot busting
  • Resists corrosive and abrasive wear

This Schaeffer OTR Plus Full Synthetic Diesel Engine Oil provides the best oil performance to help maintain engine life and performance. Schaeffer is known as the best oil in the diesel engine field for several years now.

We were impressed by this oil because it maintains fuel efficiency while providing enough wear resistance to prevent damage and protect your engine.

Synthetic oil is made up of 100% synthetic components, which makes it much more stable than diesel-based engine oils. This oil is completely non-corrosive, which is very important when it comes to diesel engine lubricants.

Moreover, the oil also helps in maintaining engine durability and has superior cold weather stability and operating characteristics. It has a unique formula that provides superior cold-weather performance as compared to other conventional oils.

It also has better soot-busting properties that help you maintain clean engine filters even during extended periods of extreme cold conditions.

Also, high-performance additives have been added to the oil to prevent carbon buildup that can cause damage to engine components. It also helps to control oil consumption and reduce the ash content of the oil.

A special blend of Micron Moly and Penetro technology helps prevent metal-to-metal contact between cylinder liner and piston ring which results in fewer engine wear issues.

Schaeffer has developed a unique additive system that contains an anti-wear component and anti-foaming agents that will help prevent sludge and varnish formation.

Overall, this engine oil is a good choice for use in any vehicle that uses a diesel engine. It is a non-toxic, environmentally friendly product that is safe to use and does not cause any damage to the engine.


  • Power stroke
  • Keep-clean performance
  • Protects engine from sludge
  • Protects against oil consumption


  • Little bit expensive

7. Mobil 1 Advanced Full Synthetic Motor Oil

Mobil 1 Advanced Full Synthetic Motor Oil

Key Features

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

The Mobil 1 Advanced Full Synthetic Motor Oil is one of the best oils for 6.7 Cummins engines. This oil has been specifically formulated to protect your engine against extreme operating conditions.

This product uses Mobil 1’s signature Triple Action Formula which is specially formulated to provide engine lubrication and protection against wear and tear.

It provides superior fuel economy and high-quality protection to keep your truck in good shape and keep you driving for a longer period.

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

Moreover, this oil delivers exceptional 10X better internal engine heat protection and outstanding low-temperature protection than the industry standard.

The low-temperature protection provided by these products can extend up to 500°F, which is perfect for the extreme heat of summer.

Furthermore, the low-speed pre-ignition (LSPI) protection provided by this oil helps control engine knock and prevents oil breakdown, which in turn helps you maintain better fuel economy.

It also provides improved wear protection for your timing chain that is a must-have for your 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, then look no further than Mobil 1 Advanced Full Synthetic Motor Oil. It is compatible with all 6.7 Cummins engines and it is highly recommended by our experts.


  • Prolongs engine life
  • Great for extreme heat
  • Helps control oxidation
  • Extended Performance


  • Low packing

8. Castrol Synthetic Motor Oil

Castrol 03084C

Key Features

  • Offer strength under extreme pressure
  • Anti-wear and deposit control protection
  • Fluid titanium technology
  • 3X stronger against viscosity breakdown

Castrol Synthetic Motor Oil is a premium motor oil for use on diesel engines. This oil is made of a blend of two different oils that are specially formulated to protect your vehicle’s engine from the extreme pressures that come with high-mileage driving.

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

This oil is also made up of different compounds that reduce metal-to-metal contact when your engine is under extreme pressure at driving speeds. It also reduces sludge deposits and improves lubrication on various parts of the engine.

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

Moreover, this oil offers strength under extreme pressure, which means it is more durable than regular oils.

Furthermore, this oil will improve your fuel economy and reduce your fuel consumption. If you want to reduce engine deposits, then you should use this product.

It also offers great anti-wear and deposit control properties that help prevent the build-up of sludge and protect the engine from damage.

The fluid titanium technology of this motor oil will increase the strength of the engine against viscosity breakdown and will improve engine wear and tear.

After testing it for several months, we can safely say that Castrol Synthetic Motor Oil is a great choice for your 6.7 Cummins engine.

Overall, this oil has a unique formula that allows it to protect your engine. It is made up of different compounds that help protect the engine and offer a great balance of performance and fuel economy.


  • High mileage
  • Great quality oil
  • Improves fuel economy
  • High Protection


  • May be burn quickly

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, or else all of that debris that has been accumulating in your engine will stay there and cause problems down the line.

Use this guide to make an informed decision about which type of oil is right for you.


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.

Many different oils will work for this type of engine, which makes your choice a bit more difficult.

Viscosity is one factor 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.


What are additives for the best oil for 6.7 Cummins? In the world of diesel engines, lubrication is a very important part of success.

 The engine oils that keep your vehicle running smoothly and safe have plenty of additives in them to help with many different things such as corrosion prevention, anti-wear protection, and more.

Some of the best conventional oils are patented with multi-additive formulas that entail 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 trick is in identifying your engine-specific needs for improving performance or reducing wear – these will lead you towards finding oil specifically tailored just for what you need from them most importantly: improved fuel efficiency as well as longer engine life span.

Oil Chemistry

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

There are many different types, each with its benefits and drawbacks that manufacturers need to take into consideration when designing a car’s system for getting power from fuels to make sure all components work properly together as designed.

Because different oils work better with certain engines and fuel types than others do which can lead to less wear on blades over time due in part to reducing carbon build-up that causes them to rust out quicker resulting in lower emissions during normal use of this type of vehicle class.

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


If you’re trying to make your life easier, why would higher-priced oil be better? Shop around and compare.

 You might even find that the lower-priced one works just as well. Keep an eye on sale items too – these may come in handy when looking for deals elsewhere or need them before they go out of stock again.

Brand Reputation

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

National brand names have a good reputation because for this reason: buying their products ensures quality assurance with peace of mind knowing there won’t be any regrets.

It is important to note that later problems may arise as a result of lower costliness or poor performance. These issues don’t show up until hours/days after the installation has occurred at the expense of even more expensive repairs downstream if something goes wrong.

Manufacturer Recommendations:

These days, the best Cummins oil for your truck’s engine is one that will be matched its needs. Check to make sure you have a manufacturer recommendation.

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 & analysis which will be best suited to meet its requirements but you may have some choices in this matter as well – though not without preference given how unique they all can be with their specific needs.

Lubricating Power

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

The wrong type of oil can often lead to degradation and ineffectiveness in these areas leading to expensive repair bills. 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. You should always try to use ‘recommended’ or ‘specified’ fluids wherever possible; however, in some applications, there are no suitable options for this purpose.

Types of Oil for 6.7 Cummins

There are a few types of oil that are best for 6.7 Cummins engines.

  • Synthetic Oil
  • Conventional Oil
  • Detergent Oil
  • High-Mileage Engine Oil
  • High-Viscosity Motor Oil

Synthetic Oil:

Synthetic oil is a type of engine oil that is made from synthetic materials. Synthetic oils are designed to provide better performance and durability than traditional engine oils. They are also less likely to clog your engine, which can lead to improved fuel economy.

Conventional Oil:

Conventional oil is a type of engine oil that is made from crude oil. Conventional oil is a type of engine oil that is made from crude oil. It is a thick, viscous liquid that is 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:

Additives are used in detergent oils. This is why they are called detergent oils. 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. Manufacturers of these blends say they perform better under extreme temperatures and high loads. Because these oils are designed to prevent high wear and tear, they are perfect 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. High-viscosity motor oils are 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. They also offer better fuel economy because the engine can run at a lower RPM.


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 because they think it doesn’t make sense how often engines need oil changes or if there are different types of oils for each temperature range needed in cars.

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 make because most people prefer their car 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 temperature/high pressure.


If you’ve made it this far, we hope that we’ve been able to help equip you with some valuable knowledge. If you’ve read the entire article, then we know that there are some new strategies to test out with your next purchase.

If you are looking for the best oil to use in your 6.7 Cummins diesel engine, look no further than. We recommend you the Valvoline Premium Blue SAE.

It’s made with the most advanced synthetic base stocks and provides improved fuel economy, reduced friction loss, enhanced wear protection, and increased horsepower output which saves money.

If you want to learn more about this product or any of our other products please contact us today.

The Shell Rotella T6 Full Synthetic 15W-40 is the best reasonable oil we recommend for 6.7 Cummins because it has all of the necessary additives to keep your engine running smoothly and efficiently.

It provides excellent protection against wear, deposits, rusting, corrosion, more power output, and better fuel economy at an affordable price point.

This makes it a great option if you’re looking to maintain your truck with minimal cost while ensuring that your engine continues performing well in tough driving conditions like off-road or winter weather driving.

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