Top 8 Best Oil For Duramax Diesel Engines: 2021 Review & Recommendations

When it comes to your vehicle’s Duramax engine, you need the best oil For duramax diesel engines. It is to make sure the engine runs smoothly and runs exceptionally well.

Getting the best oil will ensure that your Duramax will be protected and will have a long engine life. Without a doubt, the choice of motor oil is essential, especially if it is used to transport heavy loads on a long-distance journey.

However, you don’t have to worry, as this article put together all the information you need to help you choose the best oil for your engine.

In addition, this review also includes tips on how to spot the best oil and its benefits. Here is a list of the best Duramax oil on the market. Check it out and learn more.

Are You In Hurry? Then Check Out Below!

If you don’t have much time to research about it, even after you want the best one, it becomes very difficult. So you can go with this Liqui Moly Synthoil Premium. It is mainly made for engines with modern technology such as multiple valves, timing settings, supercharging, and others.

If you don’t like this as much then I am going to give a buyer guide that will help you select the best oil for Duramax diesel engines. So read the section carefully. Because this majorly includes all the things that should be checked.

Liqui Moly 2041 Premium

Liqui Moly 2041 Premium
  • For best performance, follow the manufacturer’s recommendations in your vehicle owner’s manual.
  • Excellent for cold weather
  • Decent for warm weather

Buying Guide Before Purchasing Best Oil For Duramax Diesel Engines

Choosing the best Duramax motor oil can be a daunting task for users, especially beginners in the world of motors. However, this will not become a problem if you have a guide to help you choose the correct product. If you are willing to learn, this guide is for you.


If you are buying motor oil, you will definitely meet the term viscosity grade when purchasing. Viscosity refers to the rate of oil flow at a specific temperature. Lower-grade oil or diluted oil generally flows faster into the engine at low temperatures.

Understanding the viscosity grade is crucial as it will tell you how quickly the oil will pour into the engine, reducing friction and decreasing the car’s starting time in cold weather. It is also essential that the oil can maintain this viscosity even after a long period of time.

When looking for oil, you should consult your car manual to choose the correct viscosity grades. You also need to consider where you will be using your vehicle. Fine oil is better at lower temperatures, while thicker oil is better suited for higher temperatures.


Most motor oil manufacturers have their own mix of additives in their formulation. This additive helps improve particular properties to help the engine run better.

Some additives can help clean the engine to run efficiently and make sure the oil doesn’t get too thin when the temperature gets too high and more.

Every additive is helpful, but keep in mind that you must get the oil with the right additives for your Duramax engine. Assess what your engine wants and choose the motor oil that can meet your needs. Some examples of various categories of additives are as follows:

Detergent: Additives are used to prevent the build-up of rust, deposits, and soot on the engine surface.

Dispersant: helps prevent the formation of solid particles by dispersing them in a solution. This prevents the formation of sludge in the motor.

Anti-wear agents: used to protect the metal surface, especially when lubrication films do not work.

Viscosity improvers: Refers to additives that can prevent thinning of oil viscosity at high temperatures.

Corrosion inhibitors: reduce the accumulation of water or humidity to prevent the formation of rust.

Friction modifiers – These additives are generally mistaken for antiwear additives, but their main function is to prevent friction on the engine part. This can positively affect fuel economy and help save fuel when in use.


If you want to change your current oil for a new one, you need to check if the new oil is compatible with your existing oil. If not, then you need to drain the current oil inside your engine. This is to ensure that there will be no problem when using a new oil.

Also, keep in mind that not all motor oil is compatible with your Duramax engine. You need to make sure you only use what is suitable for your engine. Remember to check your owner’s manual to find out what type of oil can be used in your engine.

Fuel efficiency

Fuel efficiency refers to the distance your car traveled burning a specific amount of fuel. The more efficient your engine, the more you can save by using less fuel. It is essential since fuel is a valuable resource that affects the economy and the ecosystem.

Good motor oil can positively affect fuel economy because it can flow into the engine faster, making it less hot. If the motor is at the right temperature, it can do its job more efficiently and it won’t damage your part. Therefore it is crucial to look for motor oil that promises a higher percentage of fuel economy.

Purpose of driving

Getting the right oil can help your engine run better. Therefore, it is essential to select the engine oil based on the type of workload.

This is useful especially if you use your engine to carry or pull heavy loads. Because of this, you have to look for the most suitable oil that can handle heavy work even in difficult conditions.

Top 8 Best Oil For Duramax Diesel Engines – Reviews

1. Shell Rotella T6 Full Synthetic

the best oil For duramax diesel engines

The first on this list is a synthetic diesel engine oil that ensures your engine is clean and protected at all times. The oil is handy because it can be used in both diesel and gasoline engines. It is an advantage, especially if you have these types of engines in your trucks and other vehicles.

With this oil, your Duramax engine is sure to be long-lasting and protected from any engine wear for a long time. It also has triple protection technology that will protect your engine from dirt and soot that can build up inside your component.

Depending on your viscosity grade, you won’t have any problems when the temperature changes. It means that the engine will run smoothly even in hot or cold weather. Other than that, it is relatively cheaper compared to other oils seen on the market.

All in all, Shell Rotella is an excellent product and is one of the best Duramax motor oils. Now you can be sure that it will work well, especially if you need heavy transport. It will also save you money as it is inexpensive, and you can maximize your fuel consumption.

  • Quite supportive formulation.
  • Effective dispersant additive.
  • Outstanding engine durability.
  • Consistent optimal pressure.
  • Poor packaging issue.

2. Liqui Moly Synthoil Premium 5W-40 Synthetic Motor Oil

the best oil For duramax diesel engines

Next on the list is a synthetic oil from a well-known brand made in Germany. The oil works to a large extent in any gas and diesel engine. It is mainly made for engines with modern technology such as multiple valves, timing settings, supercharging, etc.

If you use your Duramax engine to haul heavy loads year-round, you can trust this motor oil to do the heavy lifting for you. It will help your engine reach its full potential and improve fuel efficiency.

Even on a cold start, the oil will work immediately and lubricate your entire Duramax engine. It means that it will work perfectly even in low temperatures, which is ideal if you drive in those kinds of conditions. This is due to the excellent cold start capabilities of the engine and the pumping ability of the oil.

The oil will also help clean and remove any contaminants, helping your engine run smoothly and save fuel. It will also be helpful in removing sludge, soot, and deposit build-up that negatively affect engine efficiency.

Other than that, it holds up pretty well over a long oil change interval. You will also be amazed at how it can perfectly distribute the oil during high temperatures, which can protect your engine from overheating. It provides not only high fuel efficiency but is also helpful in reducing air pollution.

  • Excellent cold start performance
  • Excellent for cold weather
  • Decent for warm weather
  • Keeps engines clean
  • Prevents deposits and corrosion
  • Improves fuel economy
  • Quite expensive

3. AmazonBasics Full Synthetic Motor Oil – 5W-40 – 1 Gallon

the best oil For duramax diesel engines

Here we have a special type of motor oil, one designed for gas and diesel engines, which is already a huge advantage. This particular motor oil can be used by gasoline and diesel engines alike, as well as vehicles that require oil with a viscosity of 5w-40.

Note that thanks to this viscosity rating, it performs excellently in cold climates, although it also performs well in warmer climates. Please note that this is a high mileage motor oil. It is made with a special formulation that helps seal old gaskets to ensure that there are no oil leaks.

At the same time, it also helps to remove old deposits and sludge build-up from the engine while preventing new build-up. All of this leads to longer engine life, as well as better fuel economy.

  • Great for high mileage vehicles
  • Removes and prevents buildups
  • Suitable for gas and diesel engines
  • Ideal for cold weather use
  • Improves fuel economy
  • Not ideal for newer vehicles
  • Not the best wear protection

4. Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA

the best oil For duramax diesel engines

This particular motor oil is the only oil exclusively endorsed by Cummins, although it also works for Duramax engines. In fact, it is worth noting that this motor oil can be used for diesel and gasoline engines that require an oil viscosity of 15w-40. Thanks to this oil’s viscosity index, it works well for moderate and high temperatures, although it is not the best for winter driving.

Valvoline Premium Blue 8600 ES SAE 15W-40 motor oil is ideal for both new and old engines as it exhibits excellent protection against wear, friction and corrosion. It helps keep engines cleaner longer, so not only does it improve engine life, but it also improves fuel economy in the process.

In fact, it has a much better deposit prevention ability than the established industry standard. This material is loaded with so-called triple dispersant chemistry, which means that the soot does not thicken, plus it also exhibits very strong shear stability.

  • Great for older and newer vehicles
  • Excellent for keeping engines clean
  • Good performance in moderate weather conditions
  • For gas and diesel engines
  • Improved fuel economy
  • Not ideal for extremely old vehicles
  • Not ideal for cold weather applications

5. Delo XLE 400 Synthetic Blend Oil, 15W40

the best oil For duramax diesel engines

If your Duramax needs to do heavy work or take a long trip with a heavy load, then this synthetic oil blend can help. This heavy-duty oil will get your heavily used engine lubricated and cleaned, making sure it gets the job done right while prolonging its life.

Other than that, your cleaning additives will help reduce downtime on your Duramax engine and lower your maintenance cost. It can easily handle any soot and rust that can build up and damage your engine component.

The product is also powered by advanced ISOSYN technology that works best in engines in highway applications. Its manufacturer also made sure that it has a low greenhouse gas emission and can accommodate engines with Selective Catalytic Reduction (SCR) and Diesel Particulate Filter (DPF).

It has an exceptional oil pumping rate to maintain an excellent viscosity level. You will also be amazed at its long, draining ability, which provides high performance for both off-road and on-road engines. This product also promised maximum utilization and reduced downtime due to active protection mechanisms.

You may also find it more preferable than other motor oils due to its price. Your container can give you a headache, as the design of the handle will make pouring a problem. However, the product is definitely worth every penny due to its features and excellent performance.

  • A high-quality synthetic-blend oil
  • Better soot dispersant and wear protection
  • It has excellent cleaning additives making sure that your engine will last long
  • Compatible with engine compliant to lower emission systems
  • Not ideal for cold weather applications

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6. Mobil 1 112786 15W-40 Delvac 1300 Super Motor Oil – for Duramax lly

the best oil For duramax diesel engines

This particular oil is designed for use with all types of diesel engines. It works with trucks, semi-trailers, transports and also for heavy machinery. As long as you have a diesel engine that is compatible with 15w-40 motor oil, Mobil 1 112786 15W-40 Delvac 1300 Super Motor Oil will work. Thanks to its viscosity index, this oil performs well in most weather conditions,

although it does not do very well in extremely cold conditions. This material is specifically designed for engines that experience a lot of stress and pressure, for really heavy-duty engines that need a lot of protection against wear and friction.

This oil adds a great level of lubrication, which helps protect engine components from wear and damage. This particular oil also stands out for having a very low burn rate, plus it also helps improve fuel economy. When it comes to the best motor oil for Duramax diesel engines, if you need something heavy-duty, this Mobil 1 112786 15W-40 Delvac 1300 Super Motor Oil could be your best choice.

  • Excellent wear protection
  • Good for most weather conditions
  • For large vehicles
  • Helps keep engines clean
  • Lower consumption rate
  • Improves fuel economy
  • Expensive
  • Cold weather performance is not spectacular

7. Royal Purple 04154 Motor Oil

the best oil For duramax diesel engines

Patented Royal Purple 04154 premium oil additives optimize engine performance. Powerful motor oil ensures superior protection for the engine mechanism. Basically, it does not require any special treatment to perform the update. SAE 15W-40 viscosity provides greater control over efficiency. The composition is compatible with other mineral or synthetic oils.

Fully synthetic base fluid triggers rapid and rapid segregation of deposits. Your engine gets better protection against wear and other defects. Promotes interior cleaning to optimize performance.

You can mix the best Duramax LML oil with mineral or synthetic oils. Plus, it’s incredibly compatible with ethanol-containing fuel. Also, the 15W-40 rating goes very well with older and modern models.

The presence of performance additives results in a low coefficient of friction. Once again, the patented ZDDP additive induces the durability of the emissions catalyst system. Powerful technology prevents white sludge

  • No starvation for lubrication.
  • Higher engine cleanliness.
  • Incredible fuel compatibility.
  • Catalytic emission system.
  • Quite deceived packaging.

8. Amsoil Signature Series Synthetic Motor Oil

the best oil For duramax diesel engines

The high acid-neutralizing power of Amsoil Signature Series oil provides enhanced protection. The best diesel oil for Duramax is only slightly beaten by other models in terms of functionality. Features superior TBN against low viscosity degradation.

Again, the 5W-30 synthetic composition allows for temperature tolerance. Advantageous technical specifications keep the engine cool to perform at its best. Synthetic oil includes advanced and functional additive technology. Cleans internal deposits while reducing engine wear. All bearings will look like new before every session on the road.

An incredible 46% reduction in viscosity degradation saves the mechanism. Its Total Base Number (TBN) is approximately 36% more than its counterparts. Excellent acid neutralization triggers faster action.

The service life of the oil measures about 10,000 km without reducing the speed. Starts a higher KMPL (kilometers per liter) run. You can definitely save your fuel cost to enjoy smooth engine running.

  • Significant difference in output.
  • Outstanding wear protection.
  • Safe and quick engine startup.
  • Powerful additive composition.
  • No improvement in mileage.

Duramax Oil – Frequently Asked Questions

What kind of oil does Duramax take?

The Duramax diesel engine is compatible with 5W-40 and 15W-40 motor oils.

How much is Duramax oil?

Expect to spend between $ 20 and $ 70 for Duramax motor oil. Let’s go over some of the most profitable options.

How much oil does Duramax take?

The 6.6-liter Duramax engine requires 10 liters of motor oil.


Good oil is essential to maintaining engine life, as well as providing you with smooth running in all conditions. You might think that one oil isn’t the same as another but they are not at all!

Each of these oils performs perfectly for its specific application and when used together can make your Duramax work smoothly no matter what type of driving condition you’re experiencing.

It doesn’t matter which product from this list, each has been proven to provide an exceptional performance so choose wisely- because a little bit goes a long way!

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