Sylvie Willis
Diesel fuel additives are a popular topic of discussion among vehicle owners, with many people wondering about the best products to use and why they should use them. The purpose of diesel fuel additives is to improve the performance and longevity of diesel engines. During the refining process, diesel fuel receives a cetane rating, which indicates the fuel's combustion speed and compression required for ignition. A higher cetane rating indicates better fuel quality. Diesel fuel additives aim to improve the cetane rating, enhance ignition speed, and act as lubricants to protect fuel system components. Various products are available on the market, such as Hot Shot's Secret Everyday Diesel Treatment (EDT), Diesel Extreme, Archoil, Howe's, and Opti-lube, each with its unique benefits and features. Some additives focus on improving lubricity, detergent action, or increasing cetane numbers, while others aim to remove deposits and moisture or reduce emissions. The choice of additive depends on individual preferences, vehicle specifications, and desired outcomes.
Diesel Fuel Additives and their Characteristics
| Characteristics | Values |
|---|---|
| Purpose | To protect and improve the performance of diesel engines |
| Combustion Performance | Improved by higher cetane scores |
| Injectors | Cleaned and lubricated |
| Water | Removed |
| Contaminants | Removed |
| Fuel System Components | Lubricated and protected |
| Fuel Economy | Improved |
| Emissions Output | Reduced |
| Extreme Cold Conditions | Prevent fuel from turning waxy with anti-gel |
| Fuel Stabilizer | Prevent fuel from degrading |
| Lubricity | Prevent scarring and wear on fuel system components |
| Engine Performance | Improved |
| Engine Power | Improved |
| Engine Maintenance | Improved |
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What You'll Learn
Cetane rating and combustion performance
Cetane number (cetane rating) (CN) is a critical indicator of the quality of diesel fuel. It measures the ignition delay of the fuel, or the time period between the start of ignition and the first identifiable pressure increase during combustion. In simpler terms, it measures how quickly the fuel ignites after being injected into the combustion chamber. A higher cetane number indicates a shorter ignition delay, which results in more complete fuel combustion. This leads to improved fuel efficiency, reduced harmful emissions, and quieter engine operation.
The cetane number is typically measured using a Cooperative Fuel Research (CFR) engine, which involves increasing the compression ratio until the time between fuel injection and ignition reaches 2.407 ms. Another method is the Fuel Ignition Tester (FIT), which involves injecting fuel into a constant volume combustion chamber at approximately 575 °C. The ignition delay is calculated, and the cetane number is derived using an empirical inverse relationship.
The cetane number plays a similar role for diesel fuel as the octane rating does for gasoline. A higher cetane number indicates better fuel quality, with higher-speed diesel engines performing more effectively with higher-cetane fuels. Generally, diesel engines operate well with a CN from 40 to 55, with some sources specifying a range of 48 to 50.
Diesel fuel additives are designed to improve the cetane rating of the fuel, thereby enhancing its combustion performance. One such additive is Diesel Extreme, which adds seven points to the cetane score, cleans and lubricates injectors, and removes water and contaminants. Another option is Peak's Blue Agri-Clean, which boosts the cetane rating by five points, improves injector performance, and reduces emissions. These additives not only improve combustion but also protect and enhance the overall performance of the diesel engine.
In addition to cetane gains, a good diesel additive provides lubrication, improves fuel economy, and reduces emissions output. Anti-gel additives are also crucial in extreme cold conditions to prevent diesel fuel from turning into a waxy, gel-like substance that can cause fuel flow restrictions and potential engine damage. Overall, diesel fuel additives play a significant role in optimizing the performance and longevity of diesel engines.
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Lubrication and fuel economy
Lubrication is essential for protecting the fuel system components of diesel engines, such as pumps and injectors, from failure due to wear and scarring. Certain additives are specifically designed to improve lubricity, such as the LX4 Lubricity Extreme by Hot Shot's Secret, which can restore fuel quality and prevent damage to the engine.
In addition to improving lubrication, diesel fuel additives can also enhance fuel economy. Additives that increase the cetane number of diesel fuel improve its combustion performance, resulting in better fuel efficiency. Diesel Extreme, for example, is a top-tier additive that boosts cetane scores by seven points, cleans and lubricates injectors, and enhances overall engine performance. Everyday Diesel Treatment is another additive that contains a cetane improver, leading to improved engine performance and power.
Other additives can also contribute to better fuel economy by addressing specific issues. For instance, in extreme cold conditions, diesel can transform into a gel-like substance, restricting fuel flow and potentially causing damage. Anti-gel additives, such as the winter version of Motorcraft PM 22A, help prevent and remedy this issue. Additionally, stabilizers like Peak's Blue Agri-Clean can prevent fuel from degrading over time, especially in varying temperature cycles, ensuring the fuel remains usable and the engine runs efficiently.
While some additives focus on lubrication and fuel economy, others serve multiple purposes. For example, Seafoam is known for cleaning dirty fuel systems, and MMO (Marvel Mystery Oil) is used to clean carbon and varnish from ring packs and HEUI systems.
It is important to note that while additives can provide benefits, proper maintenance, such as regularly changing the fuel filter, is also crucial for optimal engine performance and longevity.
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Anti-gelling agents
Diesel fuel additives are used to improve the performance of diesel engines. They can serve multiple purposes, such as increasing the cetane rating of diesel, improving lubrication, and protecting the engine.
In cold climates, diesel fuel tends to transform into a waxy, gel-like substance, which can restrict fuel flow and cause severe damage to the engine. Anti-gelling agents, or anti-gels, are a type of diesel fuel additive designed to address this issue. They work by preventing the diesel fuel from gelling and turning waxy, even in extremely cold temperatures. This helps to ensure the smooth operation of the engine and protects it from potential damage.
One popular anti-gel product is the Howes Diesel Treat, which is marketed as North America's number one trusted anti-gel and fuel conditioner. It is effective in preventing gelling in cold climates and is safe to use in all diesel and biodiesel fuels. Diesel Treat also acts as a diesel conditioner, providing lubricity to the engine's components, preventing deposits, and improving overall engine performance.
Another well-known anti-gel additive is the Hot Shot's Secret Diesel Winter Anti-Gel. This product is designed to improve the performance of diesel engines in cold weather by lowering the cold filter plugging point (CFPP) of the diesel fuel. It helps prevent clogged fuel filters and fuel lines, improves detergency, stability, and lubricity, and boosts the fuel's cetane number.
The use of anti-gelling agents is particularly important for vehicles operating in areas with consistently cold temperatures or those transitioning between warm and cold climates. By preventing the gelling of diesel fuel, these additives play a crucial role in maintaining engine health and longevity, ensuring smooth and efficient engine operation even during the winter months.
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Water handling
Water in diesel fuel is typically nothing to worry about, as it will not harm the motor, pumps, or injectors. In fact, low-sulfur diesel fuel usually has around 50 to 65 parts per million (ppm) of water. However, when the water content reaches 100 ppm or higher, there is a greater risk of fuel filter icing. This can cause issues with the fuel lines in winter, potentially preventing fuel flow.
Demulsifiers are a type of additive that can be used to address this issue. They cause excess water to separate from the fuel and settle at the bottom of the tank or fuel system. While demulsifiers are effective, it is important to note that they are fuel-specific, and not every product will work with every type of fuel. Therefore, it is necessary to test different demulsifiers to find the one that works best with your fuel.
There are several other diesel fuel additives that can help with water issues. For example, Power Service's Diesel 911 can be used to address water in the fuel system and get the engine started again. Additionally, Star Tron enzyme fuel additive stabilizes fuel, cleans the fuel system, and breaks up water, allowing it to be burned off by the engine. Sea Foam is another option that cleans the fuel system, breaks up water, and prevents algae growth.
For those seeking a more comprehensive solution, Diesel Extreme not only helps remove excess water but also adds seven points to diesel's cetane score, improving combustion performance and cleaning and lubricating injectors and other critical fuel system components.
In summary, while water in diesel fuel is generally not a cause for concern, there are a variety of additives available to address high water content or to prevent issues in cold weather.
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Carbon footprint
Diesel fuel additives are chemicals added to diesel fuel to improve various aspects of fuel performance and engine performance, including fuel efficiency, engine longevity, and emissions output.
One of the main benefits of diesel fuel additives is their ability to improve fuel efficiency and reduce carbon emissions. For example, Dipetane enhances the combustion process, leading to better fuel efficiency and fewer carbon deposits. It also significantly reduces the emission of harmful pollutants, including CO2 and NOx. Similarly, Archoil Diesel Fuel Additive cleans the injectors, increases fuel economy, and reduces carbon deposits throughout the engine.
Another advantage of diesel fuel additives is their ability to improve engine longevity. By keeping engines clean and reducing wear and tear, additives can extend the lifespan of critical engine components, leading to reduced maintenance and downtime. For instance, Dipetane's ability to reduce engine wear and tear can result in significant cost savings over time.
Additionally, diesel fuel additives can help reduce emissions output. Detergent additives, such as those offered by Allegheny Petroleum, prevent deposit buildups on fuel injectors, improving efficiency while limiting carbon particle buildup that can block filters. Other additives, such as STP's 5-in-1 fuel system cleaner, can help increase fuel economy and clean up carbon deposits, reducing emissions and fighting engine wear.
Furthermore, diesel fuel additives can address specific issues related to cold weather conditions. In extreme cold, diesel fuel can transform into a waxy, gel-like substance, restricting fuel flow and potentially damaging the engine. Anti-gel additives, such as Hot Shot's Diesel Winter Anti-Gel, help prevent fuel gelling and improve cold starts, reducing stress on the engine and fuel system.
While diesel fuel additives offer these benefits, it is important to note that they can also introduce new challenges. For example, the United States' emission standards require removing sulfur from diesel fuel, which reduces the fuel's lubrication properties. Additives can increase lubrication, but they may also introduce contaminants that can impact engine performance and emissions. Overall, the choice of diesel fuel additive should consider the specific needs of the engine and the potential environmental impacts, as evaluated through tools like life cycle assessment (LCA).
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Frequently asked questions
Hot Shot's Secret offers several fuel additives designed to serve different purposes. Their LX4 Lubricity Extreme is a premium ultra-low sulfur diesel and gas fuel lubricity additive that helps prevent scarring and wear on your fuel system’s essential components. Their Diesel Extreme additive is another good option that cleans and lubricates injectors and other critical fuel system components.
A good diesel additive helps improve fuel economy, reduce emissions output, and improve ignition speed. It also acts as a lubricant, protecting fuel system components like pumps and injectors. In extreme cold conditions, a diesel additive can help prevent fuel from turning into a waxy, glue-like gel, which could cause severe damage.
Power Service and Stanadyne are two popular diesel fuel additives that contain anti-gel agents.
