Rajan Wilcox
Diesel fuel additives are added to diesel fuel to improve its characteristics and performance. They can be added at the refinery, distribution terminal, or by the end user. While some people swear by them, others are skeptical of their effectiveness. Additives are used to aid handling and distribution, improve fuel stability, protect engines and fuel systems, and influence the combustion process. They can also be used to prevent gelling in cold weather, make up for the loss of sulfur in diesel fuel, and offset the effects of aging. However, there is no rigorous definition of what constitutes an additive, and it is generally accepted that they are added at less than 1% w/w. While some carmakers have endorsed the use of additives, others do not recommend them.
Characteristics and Values of Diesel Fuel Additives
| Characteristics | Values |
|---|---|
| Purpose | Improve diesel fuel characteristics, including handling, distribution, fuel stability, engine and fuel system protection, and combustion |
| Use | Added at the refinery, distribution terminal, or by the end user |
| Types | Handling and distribution aids, fuel stability improvers, engine and fuel system protectors, combustion influencers, lubricity agents, fuel stabilizers, cetane improvers, winterization additives, etc. |
| Benefits | Prevent fuel gelling, improve lubricity, increase horsepower and fuel mileage, reduce emissions, dissolve asphaltenes, improve cold weather performance, enhance storage stability, etc. |
| Considerations | Potential marketing claims, inconsistent diesel quality, fuel type and storage, government emissions standards, fuel injector assessment, microbial issues, additive price and treat rate |
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What You'll Learn
- Additives can improve diesel engine performance and mileage
- They can be used to prevent gelling in cold weather
- Additives can be used to improve fuel stability and protect engines
- They can be added at the refinery, distribution terminal, or by the end user
- Some additives are used to influence the combustion process
Additives can improve diesel engine performance and mileage
Additives are substances that are added to diesel fuel to improve its characteristics and performance. They can be added at different stages: at the refinery, in the fuel distribution system, or after the fuel has left the producer. While some additives are used to aid handling and distribution, others improve fuel stability, protect engines and fuel systems, and influence the combustion process.
Additionally, additives can extend diesel fuel life by stabilising the fuel and preventing degradation. They inhibit the formation of harmful deposits, ensuring that the fuel remains in optimal condition, even during long-term storage. This is particularly beneficial for commercial fleet operators who require fuel availability over extended periods. Furthermore, additives can increase power and performance by enhancing engine power, acceleration, and overall performance.
While the use of additives may provide these benefits, it is important to note that not all additives are necessary or beneficial. Some aftermarket additives are aggressively marketed with performance claims that may not be accurate. Modern high-technology diesel engines, for example, may not require additional additives. It is always recommended to refer to the vehicle manufacturer's guidelines and use additives cautiously.
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They can be used to prevent gelling in cold weather
Diesel fuel contains paraffin wax, a normal fuel component that improves fuel viscosity and lubrication. When outside temperatures begin to fall, this paraffin wax starts to become insoluble, appearing as small crystals in the fuel. If it stays cold enough for long enough, the wax will thicken the diesel fuel. This phenomenon is called "diesel fuel gelling".
To prevent this, diesel fuel additives can be used. These additives can prevent the paraffin wax from gelling together and solidifying. Many fuel additives also offer other winter weather benefits, such as helping improve cold engine starts and removing harmful deposits from your vehicle’s fuel injectors. Additives can be added to diesel fuel at three different stages: at the refinery, in the fuel distribution system, and after the fuel has left the control of the producer.
The amount of anti-gelling additive you should add to your fuel depends on the temperature. The lower the temperature, the more anti-gelling additive you should add to your fuel. It is always smart to start using anti-gel as soon as temperatures approach freezing. If the weather is anticipating a cold front, it is better to add more anti-gel additive in preparation.
There are high-performing fuel treatments and additives that can prevent wax from turning to crystals in the first place. These additives can lower the pour and gel points, so the engine performs better at lower temperatures. Depending on your location, your fuel provider may have already added the treatment to the fuel.
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Additives can be used to improve fuel stability and protect engines
Fuel additives are chemical substances added to fuel, either gasoline or diesel, to improve its quality and efficiency. They are added at a rate of less than 1% w/w, so the physical properties of the fuel are not significantly altered. Additives can be used to improve fuel stability and protect engines in several ways.
Firstly, they can prevent fuel breakdown during long-term storage, which can result in the formation of gums, varnishes, and other deposits. This is especially important for seasonal use vehicles and equipment, such as boats, RVs, and generators, which may go long periods without use. Fuel stabilizers can also improve efficiency by preventing the separation of gas and water, which can cause hard starts and engine corrosion.
Secondly, additives can clean out harmful deposits in engines, improving performance and reducing wear and tear. Detergent additives, for example, are used to keep engine components like fuel injector valves clean, improving fuel efficiency and engine performance.
Thirdly, additives can enhance lubrication, preventing engine wear and tear by reducing metal-on-metal contact. This is particularly beneficial for diesel engines, as diesel fuel often has low lubricity.
Finally, additives can improve cold-weather performance. Cold flow improvers prevent the wax in diesel fuel from crystallizing in cold temperatures, allowing the fuel to flow freely and the engine to start more easily. This can be essential in colder climates, where diesel fuel can gel and clog fuel lines and filters.
Overall, additives that improve fuel stability and protect engines can lead to significant benefits, including improved vehicle performance, extended engine life, and reduced emissions.
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They can be added at the refinery, distribution terminal, or by the end user
Diesel fuel additives can be added at three different stages: at the refinery, in the fuel distribution system, and after the fuel has left the producer's control.
Refineries convert crude oil into usable petroleum products. The refining processes have changed with increasing fuel demand, a changing demand mix, and tightening specifications. This has resulted in the use of diesel fuel additives to increase diesel fuel yield and restore low-temperature performance. Additives at this stage are often necessary when there is a need to bias production towards gasoline, requiring the diesel pool to be supplemented with cracked gas oils from the gasoline refining process.
Fuel distribution terminals are an integral part of the petroleum distribution network, providing temporary storage for refined products before redistribution to smaller bulk plants and large commercial accounts. Terminals receive refined petroleum products by pipeline, tanker, barge, or, in remote areas, by railroad tank cars or trucks directly from refineries. The distribution stage is generally operated on a fee-for-service basis, with stable but limited profits due to regulated tariffs and competitive transport rates.
Additives can also be added by the end user or a reseller, known as aftermarket additives. These are used to meet specific needs, such as cold climate operation, or the belief that higher-quality fuel is required. Aftermarket additives allow fuel retailers to market multiple grades of diesel fuel at a retail site without needing separate storage tanks.
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Some additives are used to influence the combustion process
Diesel fuel is a liquid fuel specifically designed for use in diesel engines, a type of internal combustion engine. The most common type of diesel fuel is a specific fractional distillate of petroleum fuel oil, but alternatives that are not derived from petroleum, such as biodiesel, biomass-to-liquid (BTL), or gas-to-liquid (GTL) diesel, are also available.
Diesel fuel additives are added to diesel fuel to improve its characteristics. These additives can be introduced at different stages: at the refinery, in the fuel distribution system, or after the fuel has left the producer's control. Additives added by the end user or a reseller are called aftermarket additives.
Emissions-reducing additives are another type of additive that influences combustion. These additives are formulated to minimize harmful exhaust gases such as carbon monoxide, nitrogen oxides (NOx), and particulate matter. They are particularly beneficial in diesel engines, improving combustion efficiency, and reducing the amount of soot and other pollutants released into the atmosphere.
In cold climates, diesel fuel can gel due to an increase in viscosity as the temperature decreases. Special low-temperature diesel contains additives to keep it liquid at lower temperatures, such as ethylene-vinyl acetate (EVA), which acts as a "cold flow improver" by inhibiting the crystallization of waxes that can block fuel filters.
Overall, additives that influence the combustion process in diesel engines can provide benefits such as improved combustion efficiency, reduced emissions, and better performance in cold weather conditions.
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Frequently asked questions
Diesel fuel additives are substances added to diesel fuel to improve its characteristics and performance. They can be used to aid handling and distribution, improve fuel stability, protect engines and fuel systems, and influence the combustion process.
Diesel fuel additives are used to improve the performance of diesel fuel and engines. They can help prevent issues that arise from storing diesel for long periods, such as microbial problems, and improve cold weather performance.
While diesel fuel additives can provide benefits, they are generally not necessary for the proper operation of diesel engines. Engine makers do not typically endorse or recommend their use, and some people question the effectiveness of certain additives. However, in certain conditions, such as cold weather, additives may be beneficial.
