5 Best Oil For LBZ Duramax In 2023 | Top Ranking

The Duramax LBZ engine was available for just around 2 years. But it made a huge impact & still captures a large market because of its dependability, impressive hp, torque & the absence of different emission technology. So, to keep this beast running at its best, you should get the best oil for LBZ Duramax.

The right oil meets all the requirements, ensures proper lubrication & enhances lifespan. So getting high quality oil for duramax is absolutely necessary.

 But choosing it from so many available options can be hard sometimes.

Luckily, using our years of experience & expertise, we have done the job for you. Here, you will get in depth reviews about top 5 best oils for duramax LBZ. Check out the article from top to bottom, we assure you it will be beneficial. 


Comparison Chart:

Before getting to the main part, here’s a brief comparison about the top 5 oils. It will help you to get an idea about them & choose wisely. However, we highly recommend giving a read of the entire article. 

Top 5 Best Oil For LBZ Duramax

After taking different features & benefits, advantages-disadvantages & our personal experience into consideration, these 5 seemed really worthy for us. Hope they will be a perfect match for you.

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

No surprise! This Shell Rotella Full synthetic oil is definitely our top pick.  

We have been using it for a long long time now. Why? Because of the Excellent protection & fuel economy performance. 

It has Triple Protection plus technology & different additives which helps it to provide protection against deposits & wear. You will barely experience something like that.

The advanced formula helps to reach the critical parts of our engines faster. 

There is another best part I personally liked. Without compromising the engine quality even a bit, it has enhanced fuel economy capability of around 1.5%.

This Shell Rotella T6 oil has more to offer. It provides better viscosity control and more uptime comparatively. 

Also you don’t need to think about the temperature. The improved temperature flow helps this oil to work in both cold & hot temperatures pretty well. Our members live in different areas. And we have had nothing but good experiences regarding it. 

The composition has a low-ash formula used in it. Because of it, protection against the exhaust catalyst is ensured. 

To us, it is the Best oil for 6.6 LBZ Duramax. So you can be stress free and consider using it in your trucks or tractors or for any heavy-duty engine.

  • Technically advanced oil.
  • Provides exceptional protection.
  • Good against extreme high or low temperatures.
  • Enhanced fuel economy capability.
  • Increased shear stability.
  • Overall good engine durability.
  • One of our members onced faced a leakage problem.
  • A bit costly.


The price might seem a bit high these days, but it is undoubtedly one of the best LBZ Duramax oils. It comes as a technically advanced oil, provides excellent protection & good with the temperature as well. Use it and we hope you won’t be disappointed.   

2. Shell Rotella T5 Synthetic Blend 15W-40 Diesel Engine Oil

Next up, we have another Shell Rotella oil.

This synthetic blend oil also comes with the triple protection plus technology. That is why we never faced any kind of oil breakdown plus the protection against deposits & wear is good as well.

Worried about the temperature? Don’t be. It has better low temperature flow and performs extremely well under high temperatures. 

The build in formula helps to control the engine wear around 37% better comparatively. That is a huge advantage.

No matter what type of pick-up trucks you use or any kind of high power vehicles, this oil surely won’t disappoint you. It has increased resistance in it compared to previous models.

The Shell Rotella Synthetic oil ensures long engine life by the triple protection technology & different additives used in it. It makes sure that the other components of our LBZ or LLY Duramax engines are well protected.

The viscosity in this one is 15W-40 as you know and it performs pretty well for a wide range of heavy duty engine tasks. 

Compared to Mercedes and Volvo limits, it provides better piston cleanliness for the engines. 

It’s not over yet! This oil meets the OEM recommended oil drain interval and provides good reliability plus durability. The design seemed cool to us & it was really easy to handle.

  • Controls engine wear perfectly.
  • Good durability & reliability.
  • Nice oxidation performance.
  • Ergonomic design.
  • Some people faced problems regarding the rebate.


In that price range, it comes with a lot of stuff. So if you need to use 15W-40, definitely consider going for this one.

3. Shell Rotella T4 Triple Protection Conventional 15W-40 Diesel Engine Oil

We have used this oil multiple times and it has met our expectations.

Its heavy duty formula helps it to perform well in logging, agricultural & different mining applications. Not only that, it is perfectly formulated for severe heavy duty diesel engines.

It ensures enhanced deposit control by the advanced additive technology used in it. 

The formula helps the oil to keep the engine extremely clean at extended oil drain intervals. For Duramax engines, it ensures a longer life.

Just like the other two, it has increased shear stability. So good viscosity control is ensured.

Not in a hurry! This conventional oil has more to offer. From diesel pickup trucks to tractors to tractor trailers the oil ensures overall good protection and durability of the engine.

No matter if you are using a new or old engine, this Single 2.5-gallon bottle oil will meet up with your requirements. 

As it meets the API CK-4 requirements it has good protection &  performs well in  low-emission engines and older hard-working diesel engines. The proprietary formula helps in oil aeration & durability of the engine. 

No wonder why it grabbed a position in the top 5 list!

  • Keeps the engine really clean.
  • Formulated for heavy duty diesel engines.
  • Triple protection technology & additives ensure good protection.
  • Ensures longer life.
  • Ergonomic design.
  • Packaging issues.


Great product at a very decent price. One of the best conventional oils out there for LBZ Duramax engines.

4. Shell Rotella T5 Synthetic Blend 10W-30 Diesel Engine Oil

We have another T5 synthetic blend in our list. This 10W-30 oil provides low-temperature flow & extreme protection against all odds. 

It also has triple protection plus technology plus it’s really good for agricultural, construction machinery and different pickup trucks.

Another thing grabbed our attention. Compared to the conventional 15W-40 oils, it offers fuel economy savings upto 2%. So no worries about the budget.

Also the advanced formula helps to have good deposit control and proper resistance to heat & stress. It performs well in colder temperatures as it reaches the engines faster. 

We have used it in our cars & trucks, luckily never faced any issues. 

Just like the previous number 2 model, it also has a low ash formulation. That is why clean exhaust emission is ensured. 

We said it performs well in colder temperatures, but hot if you live under a hot climate? No need to worry! The improved oxidation performance helps it to perform well in high temperatures. The resistance is increased as well.

It has an ergonomic design as well. So we never faced any issues while handling or pouring it. So we hope you won’t have any as well.

  • Protects the exhaust catalysts.
  • Performs well in hot & cold temperatures.
  • Overall good protection.
  • Can use it in high power vehicles.
  • Leakage problems.


The price varies frequently. So check the price before getting it. It is an overall good product that ensures good performance.

5. AC Delco DexosD 0w-20 Light Duty Diesel Engine Oil

On our last pick, we have the ACDelco dexosD 0w-20 oil.

This light duty diesel oil meets the ILSAC GF-5/API standards. So protection against deposits & wear is ensured.

Another reason we considered it one of the best oils for LBZ Duramax is because its performance is energy conserving. 

One of our members uses the LM2 engine. And according to him, it is one of the best oils for LM2 Duramax Engine. 

They recommend that you should change your filter & oil after every 7500 miles (normal usage).  So for lbz duramax oil change, keep that in mind. The Dmax XD has also made This oil suitable for modern engines. 

We all know it’s hard sometimes to find Diesel rated 0W-20 in parts stores. But you can get it online for a moderate price these days. 

It is definitely one of the best 0W-20 oils for LBZ Duramax engines out there.

  • Good overall protection.
  • Performs well in turbo charged engines.
  • Really good for the LM2 Duramax engine.
  • The description could have been better.


Overall good product. Perfect product if you are looking for 0W-20 viscosity. 

Buyer’s Guide: How To Choose Right Oil For LBZ Duramax

I hope these 5 products will fulfill your requirements. But before making the final call, you should consider these things. We hope they come in handy & you get to find your perfect match.

1. Type of Oil

The first thing you should know is about the type of oil your engine needs.

Now, most of the engines need synthetic or fully synthetic oils. But you should be sure. Always read the owner’s manual before making the final call.

Though we personally recommend using fully synthetic. It has a good formulation & works perfectly in our engines. 

Also, check the LBZ duramax oil capacity. Normally the Duramax LBZ engine needs 10 quarts of oil (with oil filter). Make sure that the product meets these two requirements. It’s a must. Then go for your desired product.

2. Price

You are the one who’s buying the product. So think about your budget.

But our suggestion would be to go for the good one even if it costs you a bit. You have spent a lot on your car or truck. Then why compromise on the quality of oils?

So check the quality and then decide on the best one according to your budget. 

3. Additives

Another thing many people forget about is the additives. Check the additives or the build in formula used in the oil. 

They play a big part in our engines. From keeping the engine clean to running all the components smoothly, they have an important role to play.

So check it out if they are gonna be suitable for the engine. 

4. Viscosity

This is one of the most important things you should consider.

Check the owner’s manual or talk to the manufacturer if you do not know about the viscosity. But you should have some basic ideas about it. 

If you live in a cold area where the temperature is usually below 0° F, then you should go for 5W-40. On the other hand, you should use 15W-40 when the temperature is usually higher than 0° F.

However, in the 2001 to 2007 Duramax diesel supplements 10W-30 engine oil is listed as acceptable.

We hope you consider all of these things & choose the best oil for LBZ Duramax.

best oil for lbz duramax

Frequently Asked Questions

1. What oil should I use for a LBZ Duramax?

Answer: Well, it actually depends on the model. It depends on your specific car or truck.

While most of the cars use synthetic or full synthetic oils, there are some models which use conventional oil as well. But our suggestion would be to use the full synthetic oils. 

It uses a variety of additives & made of different components which ensures overall good performance in the engine. 

As for the viscosity, we have discussed it before. For more than 0° F & for below 0° F you should use 15W-40 & 5W-40 consecutively. And 10W-30 engine oil is listed as acceptable for 2001 to 2007 Duramax diesel supplements.

Our suggestion would be to check the owner’s manual or talk with the dealer to be sure.

2. Can I run 5W-40 in my Duramax?

Answer: The answer you are looking for is Yes, you can. 

5W-40 is highly recommended to use in the winter or in cold areas. But you can use it in the summer as well. In some Duramax engines, it is suggested to use the 15W-40. But you can use the 5W-40 as well.

3. How many Liters of oil does a 6.6 Duramax take?

Answer: If you own a 6.6 Duramax, you should keep an idea about the capacity. Hope this chart will help you out:

Oil Capacity
Engine Oil9.5 Liters
Front Differential Fluid1.7 Liters
Rear Differential Fluid3-4 Liters
Transmission Fluid(Manual)6 Liters

4. How often should you change the oil in a Duramax diesel?

Answer: There are specific recommendations from Duramax regarding this matter.

You must change the vehicle’s oil at least once every year. Or before you run around 7500 miles. It is a must to do so or your warranty might become void. 

However, we change it every 5000-7000 miles and we recommend that you do the same.

Final Thought

We hope you have found your way to get the best oil for LBZ Duramax. 

We have put a lot of our time, very own experience & expertise to get these best products for you. We hope they were helpful & you got what you came here for. But at the end of the day, it depends on your choice, budget & preference.

So take a look at all the details of the oils. Check the advantages-disadvantages & everything. Read the information on the buyer’s guide before making the final call. Then make the right decision for your beast.

Till then, ride safe!  

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