A Guide to Choosing the Best Diesel Engine Oil

May, 2019
Best Diesel Engine Oil

Buying a car is a big investment and maintaining your car will get you the most out of your investment. This is the reason why there's a large market for engine oil in the automotive industry today. Diesel engines need frequent maintenance and oil changes to ensure protection and cleanliness. This can ensure your engine will run properly and efficiently even under extreme conditions.

The best diesel engine oil is synthetic oil. It does better protecting and parts and holding up at extreme temperatures. You may notice that some engines operate better with an oil that is formulated differently. Some research will come in helpful. 

In this article, we will discuss what diesel engine oil is, its importance, and some essential factors to consider. We’ll also discuss some of the top picks of diesel engine oil so you can make the right choice. By the time you’re done reading this review, we hope you will be able to decide on what to buy.

What is Diesel Engine Oil?


Diesel oil is the oil you use to lubricate your engine and should not be confused with fuel oil. Diesel engines require a different type of oil that is specially designed for the diesel engine, not gasoline engines.

When choosing an oil check to see if it is compatible with your car. This will make sure there is no damage to your engine and that all the moving parts will run as smoothly and efficiently as possible.

The diesel engine oil is very similar to gasoline engine oil. Both have base oils that are formulated with a variety of additives to change particular oil properties. The difference between the two depends on the amount of additives that are used.

In addition, diesel engines absorb more carbon while gasoline engines tend to absorb more moisture and tar. Diesel engine oils contain a higher number of dispersants and more anti-wear additives.

Also, diesel engines require a higher level of viscosity than gasoline engine oil, and which mean diesel engines produce more heat. To sum up, diesel engine oils contain more additives because they are subject to harsher conditions.

Top Picks for the Best Diesel Engine Oil

Having a difficult time choosing which diesel engine oil to buy? Below, we will discuss some of the top choices for diesel engine oil and their features. So you can evaluate better, we will also provide some of the pros and cons of each product.

1. Castrol EDGE Turbo Diesel Engine Oil 5W-40 5L (German label)

Castrol EDGE Turbo Diesel Engine Oil 5W-40 5L (German label)

This brand name oil is well known for making good quality oil. In addition, this brand is one of the leading manufacturers of automotive and industrial lubricants.

The Castrol EDGE Turbo Diesel Engine Oil 5W-40 provides maximum wear protection for modern diesel engines. Because of the advances in engine technology, engines are now used with increased power and efficiency. In order to choose the oil that is best for you, try to compare the attributes of your car's engine and how well the oil can meet those needs. 

This product is guaranteed to maximize long-term as well as short-term engine performance. It is also designed to reduce deposits that allow optimum engine response. Another great feature is that it can sustain outstanding performance even when under pressure. The Castrol EDGE 5W-40 is proven to improve the efficiency of your engine, as well as deliver protection.


  • Provides maximum protection for your car engine
  • Offers Fluid Strength Technology
  • Can sustain maximum performance while under pressure
  • Guaranteed to improve your engine’s efficiency
  • Lowers friction
  • Great value for your money


  • Some may consider this oil as average
  • Some buyers may have some issues regarding the delivery

2. Motul 007250 8100 X-cess 5W-40 Synthetic Gasoline and Diesel Engine Oil - 5L

Motul 007250 8100 X-cess 5W-40 Synthetic Gasoline and Diesel Engine Oil - 5 Liter Jug by Motul

This brand is also one of the industry leaders when it comes to high-performance lubricants. Motul is a French lubricant manufacturer and is very well known worldwide.

The Motul 007250 8100 X-cess 5W-40 is a diesel and petrol engine oil that is 100% synthetic. The product is particularly designed for more modern cars with high displacement engines and catalytic converters. It would also work great for cars equipped with a direct injection turbo diesel.

A number of carmakers recommend the Motul 8100 X-cess 5W-40 for multipurpose use. It is suitable for unleaded and leaded petrol, LPG and diesel fuels.


  • Will work great for high displacement engines
  • Proven to keep the engine running cooler
  • Guaranteed to increase fuel efficiency
  • 100% synthetic
  • Suitable for diesel fuel, as well as leaded and unleaded petrol and LPG


  • A little expensive especially for those with a small budget
  • Not environmentally friendly

3. Rotella T6 Synthetic Heavy Duty Diesel Engine Oil 5W-40 Full  (CJ-4) - 1 Gallon 

Shell Rotella is also a well-known brand when it comes to lubricants. The manufacturer has been around for 40 years and has produced heavy-duty engine oils that offer maximum protection and performance.

The Shell Rotella 550019921-3PK T6 5W-40 oil will provide excellent wear protection and cleanliness to your engine. It is also petrol and diesel oil that is fully synthetic. To add, it features maximum high and low-temperature protection and is formulated to be 34% better than previous versions. It is heavy-duty and multi-functional. It can continuously adapt to changing driving conditions.


  • Proven to increase fuel efficiency
  • Effective with regards to resisting breakdown due to heat
  • Provides maximum wear protection and cleanliness
  • Multi-functional
  • Would work great for many vehicles using diesel engines
  • Would keep your engine running smoothly and quietly


  • Price is per gallon not per 5 liters 
  • Oil pressure might be slightly increased

4. Mobil 1 Synthetic Oil 0W-40 European Formula

This Mobil oil has good low-temperature engine start-up protection. It provides good overall protection and is a trusted brand. It works with gas and diesel engines (diesel engines without a particulate filter). 

It is good for high-performance engines and because it is synthetic will last longer than standard engine oil. It is useful for most  European car engines.


  • Works with both gasoline and diesel engines (without DPF)
  • Effectively protects engines on cold starts
  • Provides good protection in high-performance engines
  • Can use it in turbochargers and direct injection diesel
  • Works well with most vehicles 
  • Full synthetic


  • Container and shipping issues at times

5. Liqui Moly 2041 Premium 5W-40 Synthetic Motor Oil - 5L

This motor oil works well with low-temperature engine start-ups and provides good overall protection. It works with gas and diesel engines. 

It is good for high-performance engines and various types of configurations such as turbocharged and supercharged engines. It is synthetic and will protect better than standard engine oil. It helps save money on oil change since you have to change it less than standard oil.


  • Works with both gasoline and diesel engines
  • Effectively protects engines on cold starts
  • Provides good protection in high-performance engines
  • Protects well and requires fewer oil changes
  • Has great deposit protection and oil film strength
  • Full synthetic


  • May cause lower fuel economy than other oils
  • New version available that might be better for some engines  (Liqui Moly 2332)

Advantages of a Diesel Engine

Having a diesel engine has a lot of advantages compared to having a gasoline engine. In this section, we will discuss why it is more efficient and why people prefer diesel engines.

  • Older models of diesel engines create a lot of noise and are very costly to maintain. However, modern ones are quiet and they require less maintenance.
  • Unlike the gasoline engine, they are more reliable and rugged.
  • You will notice that there will be no sparks when the fuel auto-ignites. The reason is that there are no spark plug wires and plugs, so this also lowers the cost of maintenance.
  • Diesel engines are now widely used in many kinds of transportation such as trucks and buses. They are also used in the aircraft industry.
  • They are used for the combustion engines of some rail vehicles.
  • Armored and military vehicles also use this type of engine because they are unlikely to be flammable. This means that it is safer to have than a gasoline engine.
  • Aside from cars, heavy equipment, tractors, and other industrial applications also use diesel engines.
  • Diesel provides higher mileage per gallon. This is the reason why it’s preferred for heavy-duty transportation and equipment.
  • Though it may be more expensive than gasoline, diesel has higher density, which means it has more energy can be extracted.
  • Diesel is proven to be more efficient and cost-effective than gasoline. With proper maintenance, your vehicle can last longer and go further.

Factors to Consider when Choosing the Best Diesel Engine Oil

In order for you to decide effectively, you have to know what makes the best diesel engine oil. In this section, we will discuss some of the factors you might want to consider when choosing a diesel engine oil.

  • Viscosity Grade: Utilize the viscosity grade as shown in your car manual or the original equipment manufacturer. This is very important, as it will determine the starting temperatures of your engine. You'll need to pick the lubricant that can deliver maximum performance under pressure.
  • Cost: The price of your diesel engine oil may be a factor. You can review what oil will give you the best value for your money. There are cheaper ones that may or may not perform well. Being expensive is also not a guarantee of performance. The vital thing to consider is cost over value. What can you afford and is it worth it?
  • Cleaning Capability: Cleanliness is an important factor to consider when changing oils. You have to make sure that you choose the diesel oil that can clean your engine well.
  • Compatibility: Not all engine oils are formulated and are suitable for diesel engines. As discussed above, the gasoline engine usually requires a different type of lubricant. You'll need to make sure that the diesel engine oil is compatible with your engine.
  • Wear Protection: The diesel oil you pick should protect your engine effectively. It could provide your engine excellent wear protection to prolong the life of your engine.
  • Versatility: You might want to choose a diesel engine oil that is multi-functional and one you can utilize across a number of vehicles.
  • Efficiency: It's also helpful to consider how the engine oil will help with fuel efficiency.


I hope you can find the oil that best suits your needs. If you're having a hard time deciding, consider reviews and do some more research. If you're still unsure about what to get, talking to a friend or mechanic can help make your decision a lot easier.

Decide what works best for your needs and check out what others have said in their reviews of the product, and this can give you additional ideas about what to buy and what not to buy.

Do you need other products for your car? Click on this link for more reviews.

Additional Questions

Are diesel car more expensive to own? 

If you're a commuter who drives a lot, you'll love having to pay less for diesel fuel in the long run. The problem occurs when repairs are needed on your car because these can be more expensive than a gasoline engine vehicle. The answer depends on the car and how reliable it is while you own it.