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Diesel vs. Petrol
Petrol and diesel are petroleum-derived liquid mixtures used as fuels. Though both have similar base product but have different properties and usage.
|Uses||In diesel engines, heating systems||In petrol engines|
|Made from||Petroleum/ Crude oil||Petroleum/ Crude Oil|
|Energy content||35.8 MJ/L; 48 MJ/kg||34.2 MJ/L; 46.4 MJ/kg|
|Made by||Fractional distillation||Fractional distillation|
|Torque (for 10L engine)||1000 Nm @ 2000 rpm||300Nm @ 4000 rpm|
|Power (for 10L engine)||490Hp @ 3500 rpm||600Hp @ 5500 rpm|
|Power = torque*RPM||More torque at low speeds||Runs at higher RPM|
|CO2 emission||More than gasoline(petrol). Diesel fuel produces approximately 13% more CO2 gas per gallon of fuel burned, compared to gas (petrol) engines.||Lower than diesel.|
|Viscosity||increase at lower temperatures||No change|
|US Consumption (2006)||50 Billion gallons||148 Billion gallons|
|Types of ignition||Direct ( by compression )||Spark|
About diesel and petrol
Petrol is a petroleum-derived liquid mixture consisting mostly of aliphatic hydrocarbons and enhanced with aromatic hydrocarbons toluene, benzene or iso-octane to increase octane ratings, primarily used as fuel in internal combustion engines. Diesel is a specific fractional distillate of petroleum fuel oil or a washed form of vegetable oil that is used as fuel in a diesel engine invented by German engineer Rudolf Diesel.
Production of petrol vs diesel
Petroleum is refined to produce petrol and diesel. Fractional Distillation process is used on petroleum and at various temperatures, different by products are formed from it. Petrol and diesel both are derived at varying temperatures during refining process. Petrol is produced at temperature between 35 degrees to 200 degrees while diesel is produced at a boiling point of 250-350 degrees. After distillation, in order to use these byproducts as commercially acceptable petrol and diesel, some blending with other elements has to be done. Petrol is produced first in this process as it is produced at a lower temperature than diesel.
Diesel is composed of about 75% saturated hydrocarbons (primarily paraffins including n, iso, and cycloparaffins), and 25% aromatic hydrocarbons (including naphthalenes and alkylbenzenes). The average chemical formula for common diesel fuel is C12H23, ranging from approx. C10H20 to C15H28. Petrol consists of hydrocarbons with between 5 and 12 carbon atoms per molecule but then it is blended for various uses. Overall a typical petrol sample is predominantly a mixture of paraffins (alkanes), naphthenes (cycloalkanes), aromatics and olefins (alkenes). The ratios vary based on a variety of factors.
Volatility of petrol vs diesel
Petrol is more volatile than diesel, not only because of the base constituents, but because of the additives that are put into it.
Energy Content of petrol vs diesel
Gasoline contains about 34.6 megajoules per litre (MJ/l)while diesel contains about 38.6 megajoules per litre. This gives a higher power to diesel.
Global consumption of petrol vs diesel
The U.S. used about 510 billion litres (138 billion gallons) of petrol (called «gas») in 2006, of which 5.6% was mid-grade and 9.5% was premium grade. The U.S. annual consumption of diesel in 2006 was about 190 billion litres (42 billion imperial gallons or 50 billion US gallons).
Uses of petrol and diesel
Diesel is used to run diesel engines that are used in cars, trucks, motorbikes etc. Some varieties of diesel are also used in running heating systems in houses. Bad quality (high sulfur) diesel fuel has been used as a palladium extraction agent for the liquid-liquid extraction of this metal from nitric acid mixtures. Petrol is primarily used to run petrol engines in cars, motorbikes etc.
Paraffin, another byproduct of crude oil produced at 190-250 degrees is used as airline fuel.
Cost of petrol vs diesel
In countries like India, diesel is subsidized because it is heavily used for transportation. There is almost a Rs.30 difference between petrol and diesel prices in India. In the international markets both are almost equally priced. In the US, petrol was priced at $3/gallon in December 2007, diesel was priced at $3.39/gallon.
When discussed in terms of motor fuel, diesel is said to be more fuel effecient, giving almost 1.5 times the fuel efficiency of petrol.
- Uncertainties when comparing the environmental impacts of diesel and petrol
- Diesel Cars vs Gasoline Cars
- CNG vs LPG
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A Guide to Choosing the Best Diesel Engine Oil
Cars cost a lot of money and most people will do scheduled maintenance, ensuring years of good performance. This is one reason why there’s a huge market for engine oil in the automotive industry today.
Diesel engines need frequent maintenance and oil changes to ensure smooth working engines. Oil protects and can clean engine parts. It also ensures that your engine will run properly and efficiently even under extreme temperatures. The best diesel engine oil will handle extremes well and coat engine parts effectively, reducing wear.
In this article, we will discuss what diesel engine oil is, its importance, and essential factors to consider. We’ll also discuss some of the top picks for diesel engine oil on Amazon.com, so you can make your choice today if desired. By the time you’re done reading this review, we hope you will be more informed to make a good choice for you.
What is Diesel Engine Oil?
Diesel oil is the oil you use to lubricate your engine if you have a car or truck that runs on diesel fuel. It should not be used in gas engines, although some oils are on the market that say they are OK to use in either vehicle type.
When changing diesel engine oil, make sure to look on the oil cap. This will usually tell you which oil your car needs, otherwise look at your owners manual. Diesel engines are designed differently than gasoline engine, so you should choose an oil that is specifically designed for your diesel engine.
The process of choosing might come down to regular oil, synthetic blend, or full synthetic. Full synthetic is usually the best option for protecting your engine. It can handle higher temperatures and coat part better than regular oil.
What’s the Difference Between Diesel and Gas Engine Oil?
Diesel Engine Oil
Gas Engine Oil
- Made from oil and additives — These additives can help deal with acidity and carbon
- Higher anti-wear load. It uses zinc dialkyldithiophosphate for this purpose
- Higher viscosity generally
- More cleaning additives used, to deal with extra combustion by products
- Made from oil and additives — These additives can help deal with moisture and tar
- Lower anti-wear load. A gas engine’s catalytic converter can’t handle diesel oil
- Lower viscosity generally
- Less cleaning additives needed
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.
Diesel engines absorb more carbon while gasoline engines tend to absorb more moisture and tar. Diesel engine oils contain a higher amount of dispersants and more anti-wear additives. Also, diesel requires higher viscosity in the oil unlike the gasoline engine, which produces more heat. In sum, diesel engine oils contain additives that help deal with the harsh conditions inside.
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 our top choices for the best diesel engine oil and what features they have. To help you evaluate better, we will also provide some of the pros and cons of each product.
1. Castrol EDGE 5W-30 Full Synthetic Diesel Oil
This brand name is usually recognized as a quality brand, having been in the industry for a long time. In addition, the brand is one of the leading manufacturers of automotive and industrial lubricants.
The Castrol EDGE Synthetic Diesel Oil 5W-30 provides maximum wear protection for modern diesel engines. Because of the advances in engine technology, engines now have increased power and efficiency. Oils have also changed and this oil claims to work hard under these newer demands.
The 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-30 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
- Decreased engine deposits
- Some may consider this oil as average
- Some buyers might want the oil to last longer between changes
2. Motul 007250 8100 X-cess 5W-40 Synthetic Gasoline and Diesel Engine Oil
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 direct injection turbo diesel .
A number of car makers recommend the Motul 8100 X-cess 5W-40 for multipurpose use. It is suitable for unleaded and leaded petro l , 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
- Not environment friendly
3. Shell Rotella T6 5W-40 Diesel Engine Oil
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. This diesel oil is fully synthetic, meaning no crude oil was used.c Iit 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
- Would work great for many vehicles using diesel engines
- Can keep your engine running smoothly and quietly
- Oil pressure might be slightly increased
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 engine.
- 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 might notice that there are no spark plugs in your diesel engine. The reason for this is that hot compressed air is used instead. So wires and spark plugs aren’t needed, lowering some maintenance costs.
- Diesel engines are now widely used in most kinds of transportation such as cars, trucks, and buses. They are also used in the aircraft industry. They are used for the combustion engines of some trains as well.
- Armored and military vehicles also use this type of engine because they are unlikely to catch on fire. This means that it is safer to have in some cases.
- Aside from cars, heavy equipment, tractors and other industrial applications also use diesel engines.
- Diesel engines can provide higher miles per gallon. This is one reason it’s preferred for heavy-duty transportation and use in large machines. It also provides more pulling power at lower speeds, great for heavy loads.
- Though it may be more expensive than gasoline, diesel has higher density, which means more energy can be extracted.
- Diesel is proven to be more efficient and cost effective than gasoline. With proper maintenance, it can be a great vehicle to own with a long lifespan.
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 making your choice.
- Viscosity: Look at the viscosity grade shown on the label of the oil manufacturer. This is very important, as it will determine the starting temperatures of your engine. You have to pick the lubricant that is shown on the oil cover on your car or shown in the owners manual.
- Cost : The price of your diesel engine oil matters. You need to decide which oil fits your needs and budget. There are cheaper ones and ones that cost more. Research might help you decide if a certain type works well in your vehicle type. I would recommend synthetic oil because those perform the best. Sometimes your local store will have a lower cost vs internet.
- Cleaning Capability : Cleanliness is an important factor to consider when changing oils. You have to make sure that you choose the diesel oil that works well with your engine.
- Compatibility : Not all engine oils are formulated or suitable for diesel engines. As discussed above, there is also the gasoline engine that requires a different type of lubricant. You have to make sure that the diesel engine oil is compatible with your engine.
- Wear Protection: The diesel oil you pick should not cause damage to your engine. Instead, it should provide your engine with maximum wear protection.
- Versatility: Choosing the diesel engine oil that is multifunctional is a choice you might decide. Then you can utilize across a number of vehicle types.
- Efficiency : It is also a good idea to consider how the engine oil will help with fuel efficiency.
Now that we have reached the end of this article, we hope we gave you some helpful information. If you are having a hard time deciding, considering the above reviews may be helpful for you.
By reviewing the factors mentioned above, it will give you an idea of what can work best for you. Along with the product reviews, pros and cons, we hope we helped you decide which is the best diesel engine oil for you.
Do you want to learn more about other products review? Click here to learn more.
Diesel vs. Gasoline Engines
Diesel engines and gasoline engines are the two types of internal combustion engines (ICE) widely available on the car market today. These engines differ from each other in one crucial way: how fuel is exhausted in the engine.
In a gas engine, gasoline and air are compressed. At the critical pressure point, the car’s spark plug ignites this mixture, turning it into energy for your car. Diesel engines do not utilize these spark plugs. When air and diesel fuel are squeezed tightly enough, they are able to combust on their own. This is where we get the term compression ignition. All diesel engines function through compression ignition. It is possible for a gas engine to start through compression, but this can incur a great deal of damage. On the other hand, diesel engines are designed for this type of ignition.
So how does this all relate to you? You may not be a mechanic, but you’re wondering how these two engines will affect your driving experience and your bottom line. Here are some things to consider when comparing a gasoline and diesel engine car.
Diesel fuel costs more at the pump than gasoline, but diesel provides more bang for your buck in terms of energy output. Because of this, most diesel vehicles tend to get 40 or 50 miles per gallon. Overall, the gas cost is likely going to be about the same. Factors like vehicle type and driving style will affect your bottom line, but your gas costs are likely to come out relatively similar whether you’re using a gasoline or diesel engine.
Horsepower and Torque
The power output of gasoline and diesel engines are measured in two different ways: horsepower and torque. Horsepower measures the car’s overall power while torque measures the car’s ability to accelerate and adjust while driving. Because of this, having a lot of horsepower and a small amount of torque will hurt your vehicle’s acceleration. Torque gets heavy loads going, and that’s why we see diesel engines used in big trucks. On the other hand, diesel engines don’t rev up in the way that gasoline engines do. They produce less horsepower than gas engines. For this reason, race cars are built with gas engines to maximize horsepower.
Research over the years has shown that consumers are generally more concerned with torque than horsepower. Most people are looking for fast acceleration and adequate towing ability in a car.
Diesel engines are typically more reliable than gas engines due to their natural build. They rely on compression ignition, the ignition that gasoline engines can’t withstand for long. They are built tough and tend to require little maintenance. Historically, this has caused diesel engines to weigh much more than gas. Due to advancements in manufacturing, this added weight has been reduced quite a bit. Today’s diesel engines still outweigh most gasoline engines, but the difference has shrunk over the last ten years.
Additionally, diesel engines are more simple in design due to not having spark plugs or the attached electrical wiring. Generally speaking, diesel engines can travel many more miles and run for several hundred more hours before they require their first major service.
A gasoline engine is a type of heat engine, specifically an internal combustion, that is powered by gasoline. These engines are the most common ways of making motor vehicles move. While turbines can be powered by gasoline, a gasoline engine refers specifically to piston-driven gasoline engines.
Gasoline engines are a lot of the reason why the world takes so much oil out of the ground to refine into petroleum products like gasoline. Worldwide, transportation is roughly 18% of our primary energy use and gasoline is a little less than half of that.  This means that gasoline engines use roughly 8% of the total primary energy of the world.
- 1 Anatomy of an engine
- 1.1 Block
- 1.2 Cylinders
- 1.3 Pistons
- 1.4 Spark plugs
- 1.5 Camshaft
- 1.6 Injectors
- 1.7 Crankshaft
- 1.8 Flywheel
- 2 For Further Reading
- 3 References
Anatomy of an engine
The block is the backbone of the engine. It is a large block of metal, usually aluminum or steel (Formula 1 uses a magnesium alloy), with holes cut into it for the cylinders.
The cylinders of an engine are where the work is done. Fuel is injected into the cylinders, where it is ignited by the spark plugs, which moves the pistons, doing work.
Pistons are devices that slide up and down inside the cylinders. Their job is to slide in and out, connected to the crankshaft, in order to turn the combusting gasoline into work.
The job of a spark plug is to ignite the fuel inside the cylinder. The rapid expansion of the fuel, due to the heat created, does work on the piston, moving it away from the spark plug.
A camshaft is a device that manages the timing of the engine. A camshaft’s job is to regulate when fuel is let into the engine, and when exhaust is let out.
The purpose of a fuel injector is to atomize the fuel. This means to turn the liquid fuel into a mist, which drastically increases its surface area. This allows the fuel to combust more quickly, giving greater impulse to the piston.
The crankshaft is the glue that connects the parts of the engine. Its purpose is to turn the linear (up and down) motion of the pistons into rotational motion. One end of the crankshaft is attached to the camshaft, via a timing belt. The other end is connected to the flywheel, which regulates the power coming out of the engine, sort of like a surge protector for your computer.
The flywheel is a power management device for the engine. It is connected to the clutch, which is connected to the transmission. To learn more about how an engine delivers its power to the wheels, click here.
For Further Reading
- Internal combustion engine
- Transportation energy use
- Diesel engine
- Spark plug
- Or explore a random page
- ↑ EIA ‘Refining Crude Oil’ online: https://www.eia.gov/energyexplained/index.cfm?page=oil_refining Accessed August 18th, 2017.
Authors and Editors
Braden Heffernan, James Jenden, Jason Donev
Last updated: January 31, 2020