Diesel engine oil is a type of lubricant for internal combustion for engines. It is made with a combination of heavier and lighter hydrocarbons. In the past, it was typically produced from heavy fuel oil, but now petroleum distillate can also be used due to its similar boiling point and viscosity properties to those of heavy fuel oil. It is relatively expensive since it must be distilled for use in modern diesel engines. With proper lubrication, your engine will last longer and perform better. However, it’s sometimes challenging to figure out what oil is best for your vehicle. In This article we will cover all the basics you need to know about different types of diesel engine oil.
Diesel engines rely on fuel oil to lubricate the engine. Once an engine is started, the fuel oil fills the cylinders and is then ignited through a small combustion chamber. The combustion chamber contains the air needed for combustion, which is blown through a spark plug after the air reaches sufficient temperatures. When the air and fuel are combined, they combust into gases such as carbon dioxide, carbon monoxide and hydrocarbons that are released into the cylinders to be burnt with more fuel in order to release energy.
Diesel oil is a more viscous and hearty lubricant than the typical petroleum-based lubricant for petrol engines. It is especially vital for diesel engines because these engines are much heavier and run at higher pressures than petrol engines. A diesel engine features significantly larger piston rings than a petrol engine to displace fuel combustion gases from the combustion chamber in order to keep the cylinder walls clean. The oil also lubricates these pistons so as to reduce wear and tear on other parts of the engine by reducing friction.
Buyer Guide Before Selecting a Diesel Engine Oil
Choose a high grade oil that addresses the needs of your engine. Choose one that is up to the specifications of your vehicle’s engine. Check the label on the bottle to see if it contains anything that would make it unsuitable for your vehicle. The viscosity of an oil can be determined by looking at the thickness of the oil at room temperature, and is measured in centistokes.
There are two major factors to consider when buying quality diesel engine oil. The first is viscosity levels and the second is the oxidation stability. It is common knowledge that a thicker oil is usually better for a diesel engine, but it isn’t as simple as that. Choosing a thick does not mean you will get better protection. You need to tailor an oil’s viscosity to your engine’s needs, which depends on other factors like ambient temperature and load. In general though, an increase in thickness means better lubrication at higher temperatures.
The oxidation stability of an oil can vary greatly, but there are a few general guidelines. Diesel engine oils are generally categorized into three levels of oxidation: light, medium, and heavy.
A, B and C. A is the most stable and is suitable for light to medium duty engines with long operating times.
A grade oil will not start to degrade until its viscosity rises to the point where it causes major problems in the engine.
B will begin to lose its lubricating properties at higher temperatures or higher loads. The engine will use up the oil more quickly when it is cold.
C grade oil is the most unstable and will not be able to protect your engine components in different conditions. Although these oils are inexpensive and can be found in larger quantities, they are not as good for infrequent use such as lawnmowers or other small engines that do not operate under high loads or at high temperatures.
The packaging of an oil bottle should give you more information about it.
15 High Performance Best Diesel Engine Oil
If you read these instructions carefully, Then you will not face any problem while finding the best diesel engine oil.
But if you want to go with an easier way then I have listed the 15 best diesel engine oil. Because I have included all the things in my research.
1. Valvoline Premium Blue One Solution SAE 15W-40 Diesel Engine Oil
Valvoline is the latest and most technologically advanced synthetic diesel engine oil from Valvoline, which delivers performance comparable to that of triple types of ester base stocks. The product delivers optimal protection against wear under extreme conditions and improves fuel economy by reducing energy losses. This product is compatible with a wide range of vehicles and can be used in both Otto and Diesel engines.
Valvoline Premium Blue One Solution SAE Diesel Engine oil is suitable for gas or diesel engines Multi-grade viscosity index to guarantee protection of the engine in extreme temperature conditions. The new motor oil is a multi-grade viscosity index, including: 10W-40, 5W-40 and 15W-40 which correspond to different driving conditions. They are able to provide greater protection against wear in hot temperatures when the demands of power increase and reduce power losses during acceleration and deceleration.
- -Reduces wear
- -Lowers operating temperatures
- -Improves fuel economy
- -Extends engine life
- -More expensive than conventional oils
- -Not compatible with engines that require low-ash oil
2. Shell Rotella T4 Triple Protection Conventional 15W-40 Diesel Engine Oil
Shell Rotella T4 Triple Protection 15W-40 Conventional Diesel Engine Oil provides optimal protection against wear with a high temperature range and is suitable for diesel engines operating in extreme conditions. Advanced additive technology optimizes engine performance and fuel economy without compromising on the engine protection.
Shell Rotella T4 Triple Protection 15W-40 Conventional Diesel Engine Oil is suitable for both diesel and gasoline engines. The advanced additive, which adds durability and protects the engine even under extreme conditions. Shell Rotella T4 Triple Protection 15W-40 Conventional Diesel Engine Oil has a multi-grade viscosity index, including: 5W-30, 10W-30, 15W-30.
- -Helps extend engine life
- -Helps reduce wear and tear
- -Keeps engines clean
- -Good value
- -May not be suitable for all engines
- -Can cause leaks in some engines
3. ROYAL PURPLE 15W40 Synthetic Diesel Motor Oil
ROYAL PURPLE 15W40 is a synthetic diesel engine oil that is made to provide optimal performance, protection and superior quality. This product has been rigorously tested and engineered to exceed the tough standards of the American Petroleum Institute (API) specifications for diesel engine oils.
ROYAL PURPLE 15W40 Synthetic Diesel Motor Oil is a high-performance product made specifically for those who want to improve their fuel economy in the best way possible.
A high quality synthetic diesel engine oil is one that helps resist wear and tear on the engine. This product has been developed with the goal of reducing the amount of stress on the engine, which greatly reduces oil consumption.
ROYAL PURPLE 15W40 Synthetic Diesel Motor Oil is made to provide superior lubrication and protection while meeting or exceeding all current American Petroleum Institute (API) specifications. This Diesel Motor Oil provides exceptional wear protection and excellent fuel efficiency by eliminating engine wear, providing outstanding performance and delivering optimum engine cleanliness.
This Diesel Motor Oil guarantees optimum performance in forced-induction, turbocharged and high horsepower diesel engines. ROYAL PURPLE 15W40 is able to provide the optimal level of protection for your diesel engine for up to 15,000 miles. This product also helps reduce the chance of leaks and makes it easier to start your engine.
ROYAL PURPLE 15W40 Synthetic Diesel Motor Oil is made with next generation technology and highly refined base stocks that produce the highest quality synthetic diesel engine oil on the market today.
- -Excellent wear protection
- -Outstanding high-temperature stability
- -Exceptional cleanliness
- -Great fuel economy
- -May not be compatible with certain engines
- -Slightly higher price than conventional oils
4. Schaeffer Manufacturing Co. 0700CK4-006S Diesel Engine Oil
The SynShield Durability Advantage 15W-40 is Schaeffer Manufacturing Co.’s best diesel engine oil product yet. With a high level of performance and protection that offers better wear, it’s a great choice for any diesel engine or line.
This oil will protect your engine from many issues including wear, heat, fuel efficiency and power loss. This diesel engine oil is recommended for all outboards, diesels, smaller diesel engines and marine applications.
It also works well with many of the best heavy duty truck oils as well as in marine engines, generators and refrigeration. This diesel engine oil even provides protection in Cummins L10 and L11 diesel engines. it’s perfect for many farm machinery used to reduce oil consumption, keep wear to a minimum and prolong the life of your engine.
- -Helps to extend engine life
- -Reduces wear and tear on engine components
- -Keeps engine clean and running smoothly
- -Protects against corrosion
- -May cause build-up and sludge if not changed regularly
- -Can be expensive
5. Mobil 1 122260 5W-40 Turbo Diesel Synthetic Motor Oil
Mobil 1’s Synthetic 5W-40 engine oil is designed to protect diesel engines, and it does so with the help of its synthetic lubricants. For one thing, Mobil 1’s engine oil protects diesel engines during cold starts and under heavy loads. It also helps ensure that your truck will run efficiently by resisting thermal breakdown and oxidation. Mobil 1’s synthetic 5W-40 engine oil is also thicker than regular oils, which prevents some wear on parts like piston rings or cylinder linings.
This synthetic oil keeps piston rings lubricated and free of wear during extended oil drain intervals. It also resists fuel dilution, keeping injectors clean. This helps extend the overall life of any diesel engine when it is used as recommended in your owner’s manual. The SAE 5W-40 synthetic grade motor oil is designed to help you get more miles per tank of fuel and keep your engine cooler while doing it.
Mobil 1 provides professional grade products to the agricultural industry. Their premium oil, lubricants and additives work on a wide range of equipment and machinery, including motorcycles, tractors, combine harvesters, excavators, and other farm equipment. Mobil 1 provides oil for some of the most popular brands of agricultural machinery like John Deere tractors. Their products are engineered to help engines run longer and last longer.
- -Helps to extend engine life
- -Helps to improve fuel economy
- -Helps to protect against wear and tear
- -Helps to reduce emissions
- -More expensive than traditional motor oils
6. Ford Genuine XO-15W40-5QSD SAE 15W-40 Super Duty Diesel Motor Oil
This is the latest Ford oil to be developed by the ford company and it has a very low viscosity. This is ideally suited for use in heavy pickup trucks, SUVs and vans. It offers a perfect balance of performance, protection and cost-effectiveness.
The Ford Genuine 15W-40 Super Duty Diesel motor oil has recently been released by the manufacturer which has been designed for maximum protection in products with either diesel engines or gasoline engines that are powered by turbocharged or direct injected diesel engines.
This product has been developed to cover the needs of 90% of the Ford customers who are currently using regular quality motor oils. The manufacturer is hoping that this oil will prove to be very well accepted by their customers and very often when a new formula is launched it can be difficult for dealers to change their current product sales accordingly.
Ford have been releasing great value for money products for a long time now, but every once in a while something special is released that really sets itself apart from others and this one is certainly no exception.
- Excellent wear protection
- Outstanding shear stability
- Good high-temperature protection
- Low volatility
- Can be expensive
- Not readily available in some areas
7. Mobil 1 112786 Delvac 1300 Super 15W-40 Diesel Engine Oil
Mobil 1 112786 is a 15W-40 synthetic diesel engine oil which is manufactured by ExxonMobil. The oil is intended for use in diesel engines, and it is compatible with most newer diesel engines. The oil starts out as clean, non-saturating base oils that are made from a combination of petrochemicals and vegetable oils. This synthetic base oil allows the product to be easily formulated into a variety of different grades.
Mobil 1 112786 is designed to meet rigorous performance criteria including its ability to prevent wear, reduce fuel consumption and optimize engine efficiency.
This oil is designed to meet stringent American Society for Testing and Materials (ASTM) requirements for diesel engine oils.
This oil also has a low flash point. This allows quick draining of freezing water as well as quenching heavy electrical sparks with minimal spread. The low flash point also allows the oil to withstand high-temperature application such as in hot summer climates.
The lubricity properties of this product are impressive, while its resistance to oxidation limits corrosion. Mobil 1 112786 has the capability to flow in severe winter conditions and at temperatures as low as -40 degrees Fahrenheit. This product is able to prevent gelling even when temperatures are between 40 and 100 degrees Fahrenheit.
- -Helps to extend engine life
- -Excellent protection against wear and tear
- -Keeps engines clean
- -Good high temperature performance
- -Slightly higher price than some other brands
8. Motorcraft – Oil – Engine
Motorcraft engine Oil is designed to provide optimal performance, fuel economy and protection for your car engine. Made from high quality base oils and friction modifiers produced by the Motorcraft technology team in Germany, this oil is ideal for various cars including internal combustion engines.
In recent tests conducted at the university of Illinois, Motorcraft surpassed all other engine oils on engine wear tests. In addition, Motorcraft’s Multi-Grade Technology formula provides a balanced level of protection against wear and heat build-up without sacrificing any performance or emissions.
Motorcraft engine oil is more than just an engine oil. Motorcraft’s patented Multi-Grade Technology formula provides optimal performance, fuel economy and protection for your car’s engine. Multi-Grade Technology provides both lubrication and durability to keep your car running at peak performance. This innovative technology adds all of the benefits of conventional base oils without sacrificing any performance or emissions.
- -May not be available in all areas
- -Not as high-performance as some other brands
9. ROTELLA 550054466-3PK T1 SAE 40 Heavy Duty Diesel Engine Oil
ROTELLA SAE 40 Heavy Duty Diesel Engine Oil is a product that will deliver exceptional performance for your engine for long periods of time. It is formulated with a polyamide super additive which delivers exceptional protection for your engine when compared with other conventional engine oils. This product has been designed to be compatible with most of the diesel engines.
ROTELLA SAE 40 Heavy Duty Diesel Engine Oil is a motor oil that is especially made to maintain its productivity and performance even under extremely harsh conditions of engine operation. It can maintain its properties in more than 6 different temperature conditions. The oil formulation has been designed to be compatible with most of the diesel engines. This product will deliver protection for your engine against cavitation, as well as wear and tear due to heat and oxidation.
This is a synthetic engine oil that has been formulated using top quality ingredients. The product will stay lubricating in unusually harsh conditions and will safeguard your engine against damage caused by pollution and wear & tear.
The product is formulated with an advanced additive system for delivering superior protection when compared with other conventional engine oils. This helps the engine to perform at its best and to keep running properly irrespective of the operating conditions being applied.
The product has been tested and proven to resist the following heat and oxidation.
Extreme Temperature of Operation:- 180° C
The oil is formulated with an advanced additive system to deliver optimal wear protection, maintain engine life and ensure that it delivers the performance expected by the customer. The additive package includes a super polyamide. This is an extremely safe and effective formulation which can be used as a substitute for conventional engine oils in applications where it is essential to use high quality synthetic oils.
- -Helps keep engines clean
- -Good protection against wear and tear
- -Helps improve fuel economy
- -May cause leaks in some engines
- -Can be expensive
10. Castrol Edge 5W-40 A3/B4 Advanced Full Synthetic Motor Oil
This Motor Oil is a fully synthetic motor oil, which means that you don’t need to worry about your engine burning up due to lubrication issues like other less expensive oils.
Castrol Edge 5W-40 A3 provides all the benefits of a full synthetic oil including increased engine protection, better fuel economy and lower emissions. With an API service classification of A3 – the highest level available – this powerful Castrol Edge 5W-40 will keep your engine running strong for miles and miles.
Castrol Edge 5W-40 A3 Advanced Full Synthetic Motor Oil is designed to protect the engine in vehicles that require high levels of performance, such as turbo and supercharged vehicles. Your engine will also benefit from a lower level of oil oxidation for long-term protection against wear and tear as well as higher resistance against rust and corrosion.
Castrol Edge 5W-40 provides better fuel economy by reducing friction, and it can help you save money by extending the life of your vehicle.
Castrol Edge 5W-40 will increase performance while extending the life of your vehicle without damaging your engine. Its powerful formula provides all the benefits of a full synthetic oil in a versatile Castrol Edge 5W-40 that meets API service classifications, which makes it one of the best motor oils on the market. Castrol has been making lubricants and developing lubrication technology for over a century, so you can trust that this product is designed to meet the needs of modern engines.
- Full synthetic motor oil
- Advanced formula
- 5W-40 rating
- Suitable for use in a wide range of vehicles
- More expensive than conventional motor oils
- Not suitable for use in older vehicles
11. Castrol 03124 Edge 0W-20 Advanced Full Synthetic Motor Oil
This full synthetic formula features the latest technological advances in lubricant technology and is engineered to provide long-lasting protection for turbocharged engines, such as those found in Ford EcoBoost® vehicles. The formula is designed to minimize engine wear as well as clean fuel injectors without scrubbing or removing valuable deposits that could lead to increased carbon build-up.
The advanced synthetic formula features an increased viscosity that reduces the amount of oil needed for maximum wetting of the surface. Reduced wear and extended engine life provide a more satisfying experience for the driver, who can expect cleaner, more efficient performance from their Ford EcoBoost® vehicle.
- -Superior wear protection
- -Excellent low-temperature properties
- -Promotes fuel economy
- -May not be compatible with certain seal materials
12. Pennzoil Platinum Euro Full Synthetic 5W-40 Motor Oil
Pennzoil Platinum 5W-40 is a high performance oil designed to provide superior protection against wear, reduce friction, and resist oxidation. With this in mind, Pennzoil Platinum 5W-40 is recommended for use in gasoline engines with turbocharged and supercharged engines to maximize engine performance.
The best part about Pennzoil Platinum Full Synthetic Motor Oil is the fact that its deep cleaning additive will significantly increase your engine life because the additive cleans away sludge, debris, and any build up on your pistons. Additionally, to help reduce wear, Pennzoil Platinum 5W-40 is formulated to disperse quickly in all engine oil filtrations. Pennzoil Platinum 5W-40 also features a high detergent additive that will break up any build up that may be present on the delicate surfaces of your engine and increase lubricity.
Pennzoil Platinum Full Synthetic Motor Oil has been proven in our own performance testing that it can give you up to a 23% improvement in mileage over regular oil. With its synthetic formulation, Pennzoil Platinum Full Synthetic 5W-40 will also help your fuel efficiency by reducing friction within the engine.
As you can see, Pennzoil Platinum Full Synthetic 5W-40 Motor Oil is a great choice for any car owner that is looking for quality protection and savings. When it comes to lubrication, there are many types of lubricants available from conventional to synthetic.
- -Superb cleaning power
- -Excellent wear protection
- -Exceptional high-temperature protection
- -Slightly higher price tag
13. Mobil 1 Extended Performance Full Synthetic Motor Oil 5W-30
As a leading brand of high-quality motor oils, Mobil 1 has yearly ranked high in consumer reports. For example, in 2013 Mobil 1’s Mobil Super 3000 XL 5W-30 was ranked as the best conventional car oil by Consumer Reports. Mobil 1 Full Synthetic Motor Oil 5W-30, designed to protect engines against wear and sludge. It offers a strong dirt-holding capacity and provides clean engine operation.
Mobil 1 Extended Performance Full Synthetic Motor Oil 5W-30, which includes a unique blend of performance synthetic and petroleum oils to provide long-lasting protection for all types of vehicles.
extended performance synthetic motor oil that offers superior thermal stability, outstanding wear protection as well as increased oil life. This full synthetic motor oil is perfect for any vehicles under all conditions and for most extreme driving conditions where engines are exposed to high temperatures, and for the best in fuel economy.
The Extended Performance line of Mobil 1 Synthetic Motor Oils offer exceptional protection from wear and sludge, with a stronger dirt-holding capacity than conventional oil. Performance Oils offer all-season protection that provides improved oil life and dependable performance for your vehicle.
Extended Performance Motor Oil family, Mobil 1 Extended Performance Daily Use Motor Oil 5W-30 comes in a 5 litre bottle to provide extended protection for daily driving.
- -Ideal for extreme temperatures
- -Offers protection for up to 15,000 miles
- -Helps reduce fuel consumption
- -Compatible with a variety of engines
- -May be too thick for some engines
- -Can be more expensive than other motor oils
14. Supercool UV Fluid Leak Detection Dye
This Fluid is a new lubricate oil in the leak detection industry. It is the most advanced technology for detecting coolant leaks in engines, radiators, hoses, intake manifolds and other places that are hard to reach or cramped. It has been used commercially in the automotive and motorcycle industry for over 5 years now. In addition to being the most effective leak detection dye, it also saves a lot of time, money and hassle for those who perform the service.
The main advantage of this technology over other leak detection dyes is due to its unique ability to absorb large quantities of heat at a fast rate. The average thermal mass for this leak is about.
- Easy to use and apply
- Works quickly
- Helps you find leaks quickly and easily
- Not always accurate
- May not work with all fluids
- Can be messy
15. Liqui Moly Top Tec 4200 SAE 5W-30 Longlife Motor Oil
Liqui Moly 5W-30 Longlife Motor Oil is the world’s most advanced engine oil. The unique formula of high-class synthetic base oils, lithium, and molybdenum offers an outstanding protection against wear and corrosion while providing low fuel consumption.
Liqui Moly 5W-30 longlife motor oil is the world’s number one engine oil in wear protection. It is used by Ferrari, BMW and Audi, A.C.Delco and many other automobile manufacturers.
The unique composition of Liqui Moly 5W-30 longlife motor oil provides an outstanding protection against wear and corrosion while providing low fuel consumption. The “Longlife” suffix identifies a special formula which is proven to provide excellent performance, superior protection and longer service life when compared to traditional oils.
This highly-advanced formula also protects against rust, sludge, and dry-sump lubrication system deposits which are the biggest cause of engine wear. The unique formula of Liqui Moly 5W-30 longlife motor oil provides the highest level of protection when compared with any other engine oil on the market today.
- -Fully synthetic motor oil
- -Long life formula
- -Excellent engine cleanliness
- -Exceptional wear protection
- -Very good low-temperature properties
- -Reduced fuel consumption
- -May not be compatible with certain types of engines
- -Slightly higher price than some other motor oils
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FAQ: Best Diesel Engine Oil
Q: What is the best full synthetic engine oil for a diesel engine?
A: 5W30. The best full synthetic engine oil as of right now is 5W-30. It beats every other oil in all categories and is also the most popular one out here today. It’s been around since the 1990s, so it’s been tested and tested and tested still to this day.
Q: What’s the best fuel economy oil?
A: 5W-30. It’s the most popular fuel economy oil out here. You can get 5W-40 but that’s not always available for every vehicle and engine, so in winter time you can use 0W-30 which is less effective than 5W-30, which makes it have better fuel economy.
Q: What’s the difference between 5W-30, 5W-40 and 0W-40?
A: 15W and 20W. 0W-30 is the oil with highest level of detergency; it’s not that effective at removing carbon deposits, so it’s mostly used as an engine cleaner. But you can use it in cold climates, just to remove some of the sludge because 5W-30 has higher detergency than 5W-40.
Q: What’s the difference between synthetic and conventional oil?
A: Conventional oil is made from crude oil, but synthetic oil is created by mixing crude oil with a chemical. To create synthetic, you need petroleum and hydrocarbon, so you cannot use it for diesel engine. Synthetic oil can be very expensive, which makes it only for high-end vehicles with high performance like Ferrari or others high performance cars
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