7 Best Diesel Motor Oils of 2021
Before the advent of the compression ignition engine by Rudolph Diesel in 1892, diesel oil used to be a byproduct of petroleum and was thrown away.
However, today diesel oil is used extensively in diesel motor vehicles, and its presence in the motor is vital for its proper functioning.
Benefits of the Diesel Motor Oil
One of the biggest advantages of diesel motor oil is its price. Indeed, when compared to its gasoline counterpart, it is more cost-effective.
In addition, the diesel motor oil offers the various moving parts of your motor with superior wear and tear protection.
It also helps prevent the formation of varnish and deposits in the motor that can potentially affect performance.
Moreover, most top-rated diesel motor oils on the market have greater stability when compared to petroleum motor oil at very high temperatures and pressures.
Indeed, this type of motor oil does not lose its viscosity at high temperatures and will keep protecting your motor whether you drive for one minute or 10 hours straight.
In short, here is what you get with the diesel motor oil:
- More economical
- Lower gas emissions
- Prevents the formation of debris in the motor
- Better tolerance to high pressures and temperatures
- Provides more mileage to your vehicle
7 Best Diesel Motor Oils – Review
1. Motul 007250 8100 X-cess (Good Resistance to Cold & Hot Temperatures)
2. Mobil 1 120760 (Very Low Viscosity)
3. Valvoline 774038 5W-40 (Premium Oil with Quality Additives)
4. Castrol Edge 03087 5W-30 (High Mileage Guaranteed)
5. Shell Rotella T 550045126 (Prevents the Deposit of Dust & Debris)
6. Royal Purple 04154 15W40 (Compatibility with Fuels Containing Ethanol)
7. Red Line RED21405 (Excellent for Heavy-duty Vehicles)
1. Motul 007250 8100 X-cess
(Good Resistance to Cold & Hot Temperatures)
2. Mobil 1 120760
(Very Low Viscosity)
3. Valvoline 774038 5W-40
(Premium Oil with Quality Additives)
4. Castrol Edge 03087 5W-30
(High Mileage Guaranteed)
5. Shell Rotella T 550045126
(Prevents the Deposit of Dust & Debris)
6. Royal Purple 04154 15W40
(Compatibility with Fuels Containing Ethanol)
7. Red Line RED21405
(Excellent for Heavy-duty Vehicles)
1. Motul 007250 8100 X-cess – Good Resistance to Cold & Hot Temperatures
The Motul 007250 is a popular synthetic motor oil for diesel motors. What makes this oil an excellent choice is it has excellent resistance to both cold and high temperatures. So, if you are using a vehicle tin different weathers, this is
Further, this motor oil respects a wide range of standards that makes it safe to use regardless of where you are in the world.
It also has low volatility which means that it will stay in your motor for an extended period of time. Moreover, this product performs excellently in both hot as well as cold temperatures. It will not solidify even when the temperature is below zero.
All in all, taking the popularity of this product, as well as its resistance to both high and cold temperatures, we have absolutely no problem recommending it.
It is definitely one of the best synthetic diesel motor oil on the market. Even if this oil may cause a higher than average oil consumption depending on the age and make of the vehicle. Also, it is a little bit more expensive than the competition.
Notes: There is a gauge at the back of the canister that will allow you to see the amount of oil that you use
2. Mobil 1 120760 – Very Low Viscosity
If you need a synthetic motor oil that has a low-viscosity, then this product by Mobil is the right choice.
It is an excellent synthetic motor oil for used vehicles all vehicles that have high mileage. This oil contains additives that will help prevent regular wear and tear and help prolong the lifespan of your diesel motor.
In addition, it has excellent low-temperature tolerance so if you live in an area where the winter gets a very cold, get this product.
Also, the price of this synthetic motor oil makes it very hard to resist because it is more affordable when compared to others.
Notes: You need to ensure that you firmly close this motor oil once you open it. The container is not the best quality, and it may start leaking when placed in an awkward position.
Also, it may be more difficult to pour oil from this canister because it does not have the best design we have seen.
3. Valvoline 774038 5W-40 – Premium Oil with Quality Additives
If the price is not an issue for you and you are trying to get the best motor oil for a diesel engine, then the Valvoline 774038 is exactly what you are looking for.
This motor oil is a premium oil that contains many additives that will help promote the various parts inside your motor.
Additionally, it performs excellently in both hot as well as in cold weathers, no problem.
One big problem that the synthetic oils also face is oxidation. As we have noted above, the only caveat we find with this motor oil is its relatively high price.
However, you will definitely not have any problem using this product. If you have a used or new diesel vehicle, go get this premium oil right now because it is excellent even if it is priced a little higher!
Notes: Despite being one of the best oils on the market, we can only comfortably recommend this Valvoline oil to owners of new diesel vehicles.
If you own a used vehicle, there are more cost-effective solutions in this review.
4. Castrol Edge 03087 5W-30 – High Mileage Guaranteed
One problem with most synthetic oils on the market is that you regularly need to change the oil after a set mileage. If this is an inconvenience to you, then you will love the Castrol Edge because this is a high mileage synthetic oil.
In fact, the manufacturer claims that you get 20,000 miles with this synthetic oil, guaranteed. Additionally, what makes this oil unique is that it has excellent tolerance to high pressure and temperature.
If your vehicle usually runs hot, you will have no problem using this oil. In fact, you can argue that the additives inside start working more effectively at high temperatures and pressures.
Altogether, all those factors make the Castrol Edge is one of the best diesel engine oil that you can buy, especially considering it is quite affordable.
Notes: Some customers have noted that this oil may cause an increase in gas consumption in some vehicles.
Also, this oil is not Diesel VW ALH certifified so if your vehicles manufacturer recommends this certification, you may need to look for another oil.
5. Shell Rotella T 550045126 – Prevents the Deposit of Dust and Debris
The Shell Rotella is a diesel motor oil that contains many additives and technologies inside. For one, it will help prevent the deposit of debris inside the motor that can potentially affect performance.
Furthermore, it will prevent your motor oil from breaking down in high temperatures or at high pressures. It also contains additives that will help clean the motor at no cost to you.
When it comes to motor temperatures, no problem because this oil will not be affected by it. If you have an engine that runs hot, don’t worry because this oil is protected from oil oxidation and breakdown.
Also, due to the formulation and SAE rating of 15W-40, it is one of the best diesel motor oils for high power diesel vehicles like trucks or lorries.
However, you can still use it in regular diesel cars if you wish, no problem. Just keep in mind that this oil has a higher than normal viscosity, though. You may need to ask your vehicle mechanic if you're not sure about it.
6. Royal Purple 04154 15W40 – Compatibility with Fuels Containing Ethanol
If there is one thing that most oils in this diesel motor oil review lack then it is compatibility with fuels that contain Ethanol.
Indeed, this is a rare specialty that most other oils either don’t advertise for or care about altogether.
This is definitely not a problem with the Royal Purple because if your fuel does contain Ethanol, it will make its combustion in the engine more efficient.
Furthermore, it contains additives that will allow it to protect your motor from regular wear and tear. It also proactively helps combat corrosion inside the motor.
So, if you have an old motor engine, the Royal Purple is an excellent oil for your vehicle.
Notes: Since the SAE rating of this oil is 15W-40, it has a higher viscosity when compared to other oils. It is recommended to use this oil only for heavy-duty vehicles like trucks and lorries only.
7. Red Line RED21405 – Excellent Choice for Heavy-duty Vehicles
If you own a heavy-duty vehicle like a truck or a lorry, then you have to pay closer attention to the SAE rating.
Specifically, you need to choose motor oils that have a high viscosity because a low viscosity oil may damage the motor parts of a heavy-duty vehicle.
Motor oils like the Red Line are an excellent choice for trucks and lorries. It has an SAE rating of 15W-40 with a high viscosity, as well as additives that help promote the lifespan of the various motor parts.
It also offers you a high mileage which means that you do not have to change your motor oil as frequently when compared to other diesel motor oils.
Best, the canister has been designed in such a way so as to promote handling. If you need to add only a small amount of oil with precision, no problem.
The only issue we take with this oil is its price, which could have been a little bit better.
Notes: You should not use this motor oil in vehicles like diesel cars because its high viscosity will make the motor inefficient.
How to Buy the Best Diesel Motor Oil
There are several types of diesel oils on the market. You need to make sure that your vehicle is compatible with them.
This is because some vehicle manufacturers sometimes recommend only a specific type of diesel oil to use on their vehicles.
2. Types of Diesel Motor Oil
Full Synthetic Oil: Full synthetic or commonly known as synthetic oil, is the most popular type of diesel oil on the market.
It is a highly efficient oil that allows your motor to work in tiptop condition all the time.
This type of oil is also the best diesel motor oil for power-intense engines because of its low viscosity. It protects moving parts in the motor from regular wear and tears.
The only caveat with the full synthetic oil is usually its price. Indeed, when compared to other types of diesel motor oils, the full synthetic oil is around 30% more expensive.
Synthetic Blend Oil: The synthetic blend is normally a mixture of synthetic oil with mineral oil.
The synthetic blend is cheaper than the full synthetic oil and offers almost the same mileage at around 15,000 miles.
However, it does not have the same temperature resistance as high temperatures tend to affect its viscosity.
Premium Conventional Oil: The main purpose of the type of diesel oil is to prevent the buildup of deposits inside the motor.
The premium conventional oil has a large number of additives in it that not only breakdown debris and contamination but also offers excellent temperature tolerance.
If you have a motor engine that runs hot, this is the type of diesel oil to get!
Higher Mileage Oil: As its name suggests, the higher mileage oil is meant for diesel vehicles that have high mileage on the meter.
The motor is those vehicles have normally suffered from a lot of wear and tear, as well as have a significant amount of contamination and debris inside.
This diesel oil will have additives as well as the right viscosity that will help prolong the life of those used motors.
3. Viscosity Grade
Diesel motor oils come in different grades. Vehicle manufacturers normally tune their motors so that it works optimally for a specific viscosity grade.
So, it is very important that you choose a diesel motor oil that has a viscosity grade that matches your vehicle's specs.
4. Cleaning Capability
Other than protecting your diesel motor, the diesel motor oil also contains additives that help it to clean your motor from the inside out.
Ensure that you get a diesel motor oil that has those additives and will not stick or clump inside your motor every time you change the oil.
5. Wear Protection
Where protection is one of the most important factors of the diesel motor oil.
It will prevent the mechanical parts inside your motor from undergoing excessive wear and tear. It does not matter if your diesel motor is new or used, a good quality diesel motor oil will ensure minimum wear and tear regardless.
The diesel motor oil will usually make your diesel motor run more efficiently.
By efficiency, we mean that it will allow you to get more mileage out of a motor while reducing fuel consumption. Ensure that the manufacturer makes mention above the efficiency of the diesel motor oil before you purchase.
As we have seen, choosing the right type of diesel motor oil for your diesel vehicle is the first step in ensuring that your vehicle motor works the most efficiently possible.
There are several types of diesel motor oil on the market, and most oil manufacturers keep adding new types every year.
And if you change your motor oil yourself, then it is important to know which type of diesel oil is most appropriate for your vehicle.
Hopefully, our diesel motor oil review above has allowed you to find a quality diesel oil for your vehicle. If not, then go through this review again.
- Benefits of the Diesel Motor Oil
- 7 Best Diesel Motor Oils – Review
- 1. Motul 007250 8100 X-cess – Good Resistance to Cold & Hot Temperatures
- 2. Mobil 1 120760 – Very Low Viscosity
- 3. Valvoline 774038 5W-40 – Premium Oil with Quality Additives
- 4. Castrol Edge 03087 5W-30 – High Mileage Guaranteed
- 5. Shell Rotella T 550045126 – Prevents the Deposit of Dust and Debris
- 6. Royal Purple 04154 15W40 – Compatibility with Fuels Containing Ethanol
- 7. Red Line RED21405 – Excellent Choice for Heavy-duty Vehicles
- How to Buy the Best Diesel Motor Oil