Diesel engines are great quality products that require proper care to ensure high-quality performance. Thus, it is important to choose motor oil carefully as choosing the wrong product can have catastrophic problems. To save you from the trouble of searching the market for suitable products, I have prepared a detailed list of all the relevant products and their pros and cons, which will help you make the correct decision. 

8 Best Synthetic Oil for Diesel Engines Reviewed

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

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

Key Details:

  • Manufacturer: Shell Rotella T
  • Style: Heavy Duty Engine Oil
  • Viscosity: 15W-40
  • Liquid Ounces: 128 Fluid Ounces

The Shell Rotella T4 Triple Protection Conventional motor oil is another product developed by Shell Rotella. Even though the same manufacturers make it, the product lacks a lot of the benefits the other product has. However, it is a decent product at an affordable price for diesel engines.

The product has extended drain intervals for conventional motor oil. It enhances the vehicle’s overall performance and helps in achieving a smoother driving experience for the owner. This product has an extremely affordable price tag, which makes it a good economical option.

The product provides greater viscosity stability in the engine. It also improves the overall strength of the engine and aids in preventing oil/viscosity breakdown. It has triple protection against the problems of wear, deposits, and sludge, as well as motor oil breakdowns.

Despite all these benefits, it is important to remember that this product is conventional motor oil. This means that it is easily outclassed by all of the products mentioned on our list as it has fewer benefits, shorter drain intervals, and requires more frequent oil changes.   

It meets the API CJ-4, CK-4, CI-4 PLUS, CI-4. CH-4 requirements.


Pros
  • Greater viscosity stability
  • Improved performance
  • Longer drain intervals
  • Better wear protection
Cons
  • Not full synthetic

Mobil 1 Super 96819 15W-40 Delvac

Mobil 1 Super 96819 15W-40 Delvac

Key Details:

  • Manufacturer: Mobil 1
  • Style: Delvac 1300
  • Viscosity: 15W-40
  • Liquid Ounces: 128 Fluid Ounces

The Mobil Super Delvac Motor oil is the first product on our list. It is a perfect product for diesel-based engines. The product has been manufactured by Mobil 1 to primarily meet the needs of most modern-day diesel engines available on the market. 

The product greatly enhances the overall performance of the vehicle. It greatly decreases the overall oil consumption in the vehicle, thus saving the owner a significant amount of money. It also has excellent additives that reduce the overall wear in the engine.

The product works great under high as well as low temperatures. Under high temperatures, the product protects the engine by providing thicker lubrication to the necessary engine parts. This prevents them from overheating and getting damaged under the constant stress they undergo.

The product has a highly affordable price tag which makes it great for most customers. It also has improved packing, which helps in preventing leaks. However, a common problem associated with the product is frequent reports of injector failures that can be catastrophic for the vehicle. 

It meets the OEM requirements and performs exceptionally well in all conditions.


Pros
  • Good performance under cold temperatures
  • Improved packaging
  • Reduces oil consumption
  • Affordable product
Cons
  • May lead to injector failure
4

Castrol EDGE 5W-30 C3 Advanced Full Synthetic Motor Oil

Castrol EDGE 5W-30 C3 Advanced Full Synthetic Motor Oil

Key Details:

  • Manufacturer: Castrol
  • Style: Advanced Full Synthetic
  • Viscosity: 5W-30
  • Liquid Ounces: 160 Fluid Ounces

The Castrol Edge Advanced Full Synthetic Motor oil is the next product on our list. Castrol has manufactured it to provide you with a top-class performance for whichever vehicle you choose to use the product in. It has added detergents that help reduce the commonly faced problems.

The product has been specially designed to improve the strength of the engine. It improves the overall oil film strength by 30%, which provides the vehicle with more excellent stability and helps to avoid the commonly faced problem of oil/viscosity breakdown.

The product reduces the overall presence of sludge and deposits in the engine, which over time can be lethal if not treated timely. It helps in maximizing the performance of the vehicle and helps you in achieving a smoother driving experience. It has up to 10x better performance under high temperatures.

It also greatly improves the overall fuel economy of the vehicle, which is always helpful. The only problem associated with the product is that the oil burns significantly faster than most other products mentioned on the list. This can be a big problem for the owner and drive up the overall expenses. 

It meets the API SN, CF, ACEA C3 requirements and provides excellent performance in all terrains.


Pros
  • Enhances engine performance
  • Reduces friction
  • Increased strength
  • Improves fuel economy
Cons
  • Increased oil burning

Valvoline Premium Blue Extreme SAE 5W-40 Full Synthetic Engine Oil

Valvoline Premium Blue Extreme SAE 5W-40 Full Synthetic Engine Oil

Key Details:

  • Manufacturer: Valvoline
  • Style: Platinum Blue Extreme Full Synthetic
  • Viscosity: 5W-40
  • Liquid Ounces: 1 Gallon

The Valvoline Premium Blue Extreme full synthetic oil is yet another excellent product manufactured by Valvoline. The product provides your vehicle with overall improved performance and is compatible with almost all modern-day engines to help you achieve a better driving experience.

The product has excellent protection against th3e problem of wear which is extremely common in modern-day engines due to the high pressure they undergo. It also decreases the presence of any sort of sludge or deposits in the engine by improving the overall cleanliness of the engine.

The product provides an improved performance under cold temperatures. Despite being of a higher winter-grade, the product resists the problem of poor start-up or LSPI. Under hot temperatures, it improves the overall protection of the engine parts that are prone to damage.

The product also has better protection against the problem of corrosion. A major concern associated with the product is that the container is made out of poor-quality material, making it prone to leaks. This problem can result in overall higher expenses for the owner.

It meets the API CK-4, CJ-4, CI-4 PLUS, CI-4, CH-4, SN requirements and is endorsed and recommended by Cummins.


Pros
  • Enhances fuel economy
  • Better performance under cold temperatures
  • Greater wear protection
  • Improved corrosion protection
Cons
  • Poor container quality

Royal Purple 15W 40

Royal Purple 15W 40

Key Details:

  • Manufacturer: Royal Purple
  • Style: Duratec Super Diesel Oil
  • Viscosity: 15W-40
  • Liquid Ounces: 1 Gallon

The next product on our list is the Royal Purple Super diesel motor oil. As the name suggests, it has been developed by Royal Purple. The product provides excellent performance for most diesel engines and reduces the presence of any pre-existing problems it may have.

The product greatly improves the overall protection in the engine from the problem of corrosion. The problem of corrosion can deteriorate the engine’s quality and can result in poor performance. It also decreases the overall wear in the engine. Moreover, it provides the vehicle with better engine cleanliness. 

The product performs excellently under both hot and cold temperatures. For cold temperatures, the product fights off the problem of LSPI. As for the hotter conditions, protect the engine from any sort of damage that may be caused in the engine due to excessive heat or stress.

It extends the overall drain intervals, which is always helpful. The only problem with the product is that since it provides the vehicle with such a wide variety of benefits, the pricing of the same is higher than many of its competitors available in the market.

It meets the API service CI-4, CI-4 PLUS, CJ-4, and CK-4 requirements.


Pros
  • Improved corrosion protection
  • Extended drain intervals
  • Greater engine cleanliness
  • Excellent cold temperature protection
Cons
  • Costly product

Shell Rotella T4 15W 40

Shell Rotella T4 15W 40

Key Details:

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

The Shell Rotella T6 Full Synthetic Motor oil is perhaps one of the better options available on the market for diesel-based engines. Shell Rotella has designed the product with utmost precision to provide your vehicle with overall improved performance. It greatly improves the fuel economy of the vehicle.

, the product is full synthetic motor oil, thus providing better performance than most conventional and synthetic blend motor oils available on the market. It reduces the presence of sludge and deposits in the engine by improving the cleanliness in the same.

The product provides improved protection against the problem of heat. This also protects the engine from developing permanent problems, which can be caused due to the excessive heat and stress the engine has to endure. It also has extended drain intervals and requires fewer oil changes than the others.

It has a unique low-ash formula that reduces the overall poisoning of the exhaust. The only common problem associated with the product is that the container is made out of an average material, which makes the problem of oil leaks and spills quite common.  

It meets the API SERVICE CK-4, CI-4, CI-4 PLUS, CJ-4, CH-4 requirements and is an excellent product. 


Pros
  • Greater heat resistance
  • Improves fuel economy
  • Better wear protection
  • Reduces sludge and deposits
Cons
  • Common oil leaks

Pennzoil Platinum Full Synthetic Motor Oil 5W-30

Pennzoil Platinum Full Synthetic Motor Oil 5W-30

Key Details:

  • Manufacturer: Pennzoil
  • Style: Platinum Full Synthetic
  • Viscosity: 5W-30
  • Liquid Ounces: 160 Fluid Ounces

The Pennzoil Platinum Full Synthetic Motor Oil is the next product on our list. As the name states, the product has been manufactured by Pennzoil. It has been specially designed to meet the needs of most diesel engines. It also improves the overall performance of the vehicle and eliminates any problems.

Unlike the other motor oils, the product is made out of natural gas, which is made out of crude oil. This is achieved by Pennzoil’s patented Pure Plus gas-to-liquid technology. This helps in deriving a cleaner engine with fewer deposits and impurities, thus giving you high-quality motor oil.

The product has excellent protection against the problem of wear. If the problem is not treated timely can result in deterioration in the performance of the vehicle, or worse, leave permanent damages to the engine. The product has excellent detergents that thoroughly clean the necessary engine parts, especially the piston.

It maximizes the fuel economy of the vehicle. The product also has greater protection against the problem of corrosion. The only problem associated with the product is that the seal of the container is made of poor material, which makes it prone to leaks. 

It meets the ILSAC GF-6A, API SP, ACEA A5, B5, A1, B1 requirements and is certified by the American Petroleum Institute.


Pros
  • Reduces corrosion
  • Protects horsepower
  • Greater wear protection
  • Cleans pistons
Cons
  • Poor seal quality

Castrol EDGE 03087 5W-30

Castrol EDGE 03087 5W-30

Key Details:

  • Manufacturer: Castrol
  • Style: Advanced Full Synthetic
  • Viscosity: 5W-30
  • Liquid Ounces: 160 Fluid Ounces

The last product on our list is the Castrol Edge Extended Performance Advanced Full Synthetic motor oil. This product has also been manufactured by Castrol and is an excellent choice for most modern diesel engines. It has a wide variety of benefits and would be a great product.

It has excellent resistance to the problem of oil/viscosity breakdown. This is made possible due to the product having higher strength and stability additives. It also has greater protection against the problem of wear, which can cause a decline in the performance of the vehicle if left untreated.

It has up to 10x better performance under high temperatures. This helps in fighting off the problem of LSPI under cold temperatures, and for hotter conditions, it protects the engine from the damage it undergoes. The product has 3x better strength against viscosity breakdown (when compared to Mobil 1 Extended Performance.)

The product has an extremely reasonable price for the benefits it provides. The only common problem associated with the product is that the oil burns significantly faster than some of the other advanced full synthetic oils mentioned on our list, which can result in expensive replacements.

It meets the API SN, ILSAC GF-5, ACEA A1, B1 requirements and is certified by the American Petroleum Institute.  


Pros
  • Affordable product
  • Better resistance against breakdown
  • Excellent engine strength
  • Greater cold temperature performance
Cons
  • Faster oil burning

Oil Buying Guide for Diesel Engine

The Viscosity

The viscosity is the most important detail one has to know about before making a purchase. Thinner oils are better suited for colder conditions as they have more free-flowing oil, which helps in reducing the problem of poor start-ups and LSPI.

On the other hand, Thicker oils are better for warmer conditions, as they help protect the engine from damage under extreme stress. This is achieved by creating thicker lubrication around the necessary parts. Diesel engines recommend using oil with 15W-40 or 5W-40 viscosity for best performance.

The Oil Type

The oil type is the next important detail you have to pay attention to. There are 3 main oil types available on the market: conventional, synthetic blend, and full synthetic motor oils. The conventional oils provide the vehicle with standard performance and have a cheap cost.

Synthetic blend motor oil has a slightly expensive price tag than conventional oils however provides the vehicle with a lot more benefits than the latter. The last one is fully synthetic oil. They deliver the best performance and provide your vehicle with a wide variety of benefits. Due to this reason, they are the costliest out of the three.

Diesel engines recommend using full synthetic motor oils instead of conventional oils as they provide the engine with better performance.

Extra Features

If you still are in two minds about which product to purchase, then perhaps paying close attention to their additional benefits might help you. For instance, if your vehicle has developed a problem of poor engine start-up, then choosing a product that helps in resolving that problem will be the best option. 

Frequently Asked Questions

Diesel engines recommend using products with a viscosity of 5W-40 or 15W-40, depending upon the temperature.

This answer depends on varies from vehicle to vehicle. For example, a ford f-250 diesel engine can hold up to 15 quarts of oil.

Castrol, Shell, Pennzoil, and Royal Purple are good options for diesel engines.

Diesel engines require either fully synthetic or synthetic blend motor oils.

It is recommended to change oils every 7,500 – 10,000 miles when using full synthetic oil. On the other hand, while using a synthetic blend motor oil, oil changes should be made every 5,000 miles.

The Viscosity

Diesel engines require either fully synthetic or synthetic blend motor oils with a viscosity of 5W-30 or 15W-40. The Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil is perhaps the best option available on the market. However, if you are looking for a more economical option, then the Castrol Edge Extended Performance 5W-30 Advanced Full Synthetic Motor Oil would work well.

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