Sylvie Willis
Diesel fuel additives are necessary to protect the fuel's lubricity, cetane rating, cold weather performance, and stability. Unlike gasoline, diesel is a heavier fuel that is more susceptible to change over time, even when stored. Lubricating diesel additives are essential to prevent premature engine wear and tear, enhance fuel efficiency, and reduce soot and particulate matter produced during combustion. In cold weather, anti-gel additives are crucial to prevent fuel gelling and improve engine performance. Additionally, with the government's tougher emissions standards, diesel engine makers now install special emissions control equipment to reduce air pollution. While some recommend various additives like Hot Shots, Seafoam, and Schaeffer's Diesel Treat, others suggest that proper maintenance, regular fuel filter changes, and the use of biocides for microbial problems are more important.
Characteristics and their values for diesel fuel additives
| Characteristics | Values |
|---|---|
| Anti-gel additives | Improve engine's cold-weather performance |
| Anti-gel additives | Do not harm the engine |
| Anti-foam additives | Reduce surface tension in air bubble walls |
| Anti-foam additives | Help clean the fuel management system |
| Cetane number improvers | Increase fuel decomposition rates |
| Lubricity | Protect modern diesel engine components |
| Lubricity | Reduce fuel pump and injector wear |
| Lubricity | Reduce wear in rotary mechanical fuel-injection pumps |
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What You'll Learn
Anti-gel additives
Diesel fuel contains paraffin, which starts to crystallize at 32°F (0°C). When the temperature drops further to somewhere between 11°F and 15°F (-11°C and -9°C), the paraffin turns to gel, clogging the fuel tank and filters. This can restrict fuel delivery, resulting in reduced engine performance.
There are several anti-gel additive products on the market, including Hot Shot's Secret, Boostane, Optilube, Archoil, and Diesel Kleen. Some users have reported success with these products, while others have found them ineffective or unnecessary. It's important to note that using additives can void warranties in some cases, and it's always a good idea to consult a professional before adding anything to your fuel.
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Lubricity additives
It is recommended to use lubricity additives with every fill-up to maintain optimal engine performance. For example, Hot Shot's Secret LX4 Lubricity Extreme is designed to be used with every tank of fuel and is compatible with other fuel additives. Following the recommended treat rates, such as 1 ounce per 10 gallons for gasoline or pump diesel, ensures that your engine receives the proper lubrication. This can lead to improved fuel efficiency, reduced engine noise, and a smoother idle.
In addition to enhancing lubricity, many lubricity additives offer multiple benefits. For instance, Opti-Lube XPD not only enhances lubricity but also boosts cetane, cleans injectors, and includes an anti-gel. This multi-functional additive improves the overall quality and performance of diesel fuel. By choosing a lubricity additive with additional features, you can further enhance the performance and longevity of your diesel engine.
While lubricity additives offer numerous benefits, it is important to select reputable products that are warranty-safe and emissions-safe. Some additives may void your engine's warranty, so it is essential to check compatibility. Additionally, opt for products that are safe for the environment, such as those that do not contain harmful alcohols. By choosing high-quality lubricity additives, you can maintain the performance and longevity of your diesel engine while also protecting the environment.
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Cetane rating additives
Cetane improvement additives work by increasing the fuel decomposition rate, causing the fuel to ignite faster. This results in improved engine performance, including increased fuel economy, enhanced power output, and reduced emissions. Additionally, these additives can help improve cold-weather performance by lowering the gelling point of the fuel, preventing clogging of the fuel tank and filters.
It is important to distinguish between the cetane number and the cetane index. The cetane number is obtained through a standardised ASTM test using a specially calibrated engine, while the cetane index is an estimation based on the fuel's density and distillation range. Cetane improvers do not affect the cetane index but raise the cetane number. Therefore, when choosing a cetane additive, it is crucial to select one that improves the cetane number rather than the index.
Some common chemicals used as cetane rating additives include alkyl nitrates, principally 2-ethylhexyl nitrate, and di-tert-butyl peroxide. These additives are highly combustible and cause the fuel to burn faster, resulting in a higher cetane number. Premium diesel fuels may also use other additives to improve lubricity, detergents to clean fuel injectors, water dispersants, and other additives depending on geographical and seasonal needs.
While cetane rating additives can provide benefits, it is important to exercise caution. Some additives can be expensive, and there may be concerns about their effectiveness. Additionally, certain additives have been known to void warranties, so it is essential to consult a trusted mechanic or expert before using any additive in your diesel fuel.
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Cold weather performance additives
To combat this issue, anti-gel additives are a popular choice. These additives lower the gelling point of the fuel, improving engine performance in cold weather. It is recommended to use anti-gel additives when temperatures reach the freezing point and to add them before filling up the tank to ensure a proper mix. Additionally, anti-gel additives can be used in emergency situations when fuel or fuel filters have already frozen.
Another type of additive is the anti-foam additive, which reduces surface tension in air bubble walls, preventing foaming during refueling. This is particularly beneficial for diesel vehicles with irregularly shaped tanks, as excess foam can cause premature fuel cut-off, resulting in a half-filled tank.
Cetane number improvers are also available to increase the quality of diesel fuel. Low-quality cetane diesel can make it difficult to start a vehicle, especially in cold weather, and can lead to higher fuel consumption, increased noise levels, and more emissions. Cetane improvement additives help increase fuel decomposition rates, resulting in faster fuel ignition.
Some popular choices for cold-weather diesel fuel additives include Hot Shot's Secret Diesel Winter Anti-Gel, Pure Motoring Products' ARTIC FLO and Diesel Aid, Power Service Diesel Fuel Supplement, and Howes fuel conditioner.
It is important to note that while additives can improve cold-weather performance, they should be used in accordance with manufacturer recommendations and may not be necessary for all diesel engines.
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Stability improver additives
Diesel fuel additives are used to improve the characteristics of diesel fuel. They can be added at the refinery, distribution terminal, or by the end user. Diesel fuel contains paraffin, which starts to crystallize at 32°F (0°C) and turns to gel at 11-15°F (-11 to -12°C). This can clog the fuel tank and filters, leading to reduced engine performance. Anti-gel additives are commonly used to lower the gelling point and improve cold-weather performance.
Another issue with diesel fuel is that it tends to accumulate air during refueling, forming foam. This can cause premature fuel cut-off in vehicles with irregularly shaped tanks. Anti-foam additives reduce surface tension in air bubble walls, causing them to burst and eliminating foaming. They also help clean the fuel management system, especially the fuel injector, by preventing the accumulation of residues.
Cetane number improvers are additives that increase the cetane quality of diesel fuel. Low-quality cetane diesel can make it difficult to start the vehicle, especially in cold weather, and can lead to higher fuel consumption, noise levels, and white smoke emissions. Cetane improvement additives increase fuel decomposition rates, resulting in faster fuel ignition.
Oxidation is another issue in diesel fuel that can cause fuel stability problems. Antioxidants and stabilizers are used to inhibit chain-branching reactions or intercept free radicals, forming stable radicals that do not propagate further. This prevents the formation of gums and sediments, which can block fuel filters and impact vehicle operability.
In summary, stability improver additives in diesel fuel are important to maintain engine performance and fuel stability. They help prevent issues such as gelling, foaming, and oxidation, which can impact the performance and operability of diesel engines.
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Frequently asked questions
Diesel fuel is heavier than gasoline and is more prone to change over time, even when in storage. Additives are necessary to protect its lubricity, cetane rating, cold weather performance, and stability.
Without additives, the fuel injectors can become clogged with deposits, reducing engine performance. In cold weather, the fuel can gel and clog the fuel tank and filters.
Additives should be added to diesel fuel when temperatures drop, especially if they are expected to reach the freezing point. It is also recommended to add additives when the diesel composition in your vehicle changes.
Some popular additives include Power Service, Schaeffer's Diesel Treat, Seafoam, Howes, Lucas, Hot Shots, HSS Winter, and Archoil.
