Regan Brown
The colour of diesel fuel varies and can be bright green, clear, yellow, blue, or red. The different colours are due to the dye put in the diesel. For example, UltraLow Sulfur Diesel is red and for off-road use, while green diesel is for highway use and is taxable. The colour of diesel fuel can also be an indication of its quality. For instance, old diesel fuel tends to be darker, and the presence of algae can turn diesel dark green or navy blue.
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What You'll Learn
Diesel fuel colour variations
Clear diesel fuel is made for on-road vehicles, including passenger vehicles, SUVs, marine vehicles, and large trucks. This type of diesel has low sulfur levels and is legally taxable, so any vehicle with a diesel engine licensed for on-road use must use this type of fuel. Clear diesel is the standard fuel available at gas stations throughout the US.
Red-dyed diesel is the most common diesel used for off-road vehicles and equipment, including tractors, cranes, forklifts, planes, and boats. This type of diesel is chemically identical to clear diesel but is not subject to the same fuel taxes. The red dye signifies that the fuel is intended for off-road use and is not taxed for road use.
Blue-dyed diesel is reserved for US government purposes, including planes and military vehicles, and is not intended for use by the general public. This type of diesel is also not taxed as the government is the only customer.
Green-dyed diesel, also known as biodiesel, is used in some parts of the world as a road fuel with a biodiesel component as part of sustainability initiatives. The green colour is sometimes faint and used to signify the fuel's eco-friendly nature. It is important to note that the colour of the dye does not change the fuel's fundamental properties, and using biodiesel can lead to algae growth in the fuel.
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The impact of diesel colour on engine performance
The colour of diesel fuel is an important indicator of its quality and performance. While diesel is typically clear, it can also be found in shades of yellow, red, blue, and green. The colour of diesel is not merely for aesthetic purposes but is deeply intertwined with regulatory practices and the chemical composition of the fuel. The primary purpose of colouring diesel is to indicate its tax status and differentiate it from untaxed fuels. For example, red diesel is used for off-road machinery and is tax-exempt, whereas clear diesel is meant for on-road vehicles and is subject to federal excise tax.
The colour of diesel can also provide information about the condition of an engine. Soot, ash, and carbon can darken the fuel and spread throughout the engine, causing performance issues. In addition, the practice of fuel adulteration, or mixing diesel with cheaper substances, can alter the colour and jeopardise engine performance and longevity. This can lead to costly engine repairs and increased emissions.
Green diesel, in particular, is often used as a biodiesel or as part of sustainability initiatives. Biodiesel is made from plant matter and is more susceptible to algae growth, which can affect engine performance. However, the colour of the dye does not change the fundamental properties of the fuel, and using dyed fuel in an on-road vehicle will not ruin the engine. Nevertheless, it is important to be vigilant about the colour of diesel as it can indicate potential issues with fuel quality and compliance.
Industry professionals who rely heavily on diesel must take a proactive approach to managing fuel supplies. This includes regularly inspecting fuel deliveries for colour consistency, utilising proper storage facilities to prevent contamination, and educating staff about the importance of fuel colour. By doing so, they can ensure the quality and integrity of their operations and avoid costly issues down the line.
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The impact of diesel colour on mileage
The colour of diesel fuel is an important feature, as it indicates its tax status and differentiates it from untaxed fuels. The primary purpose of colouring diesel is to enforce regulatory, practical, and safety considerations in the supply chain and use of diesel. The colour of diesel can vary from clear to red- or blue-dyed, with clear diesel being the most common type found at gas stations and used for on-road vehicles such as cars, trucks, and SUVs. Red-dyed diesel, on the other hand, has a higher sulfur content and is intended for off-road vehicles, making it exempt from road taxes. While the colour of diesel fuel is significant for regulatory purposes, it does not impact the fuel's fundamental properties or its performance.
In some parts of the world, green diesel is used as a biodiesel or a road fuel with a biodiesel component, often as part of sustainability initiatives. The green colour may be faint and used to signify the fuel's eco-friendly nature. However, biodiesel is more susceptible to algae growth, which can turn the fuel dark green or navy blue. While this discolouration may be aesthetically unpleasing, it does not appear to have a significant impact on mileage.
One user reported that they achieved better mileage with green diesel in California compared to other states, but this could be due to various factors such as road conditions or speed limits. Additionally, the user mentioned that they added used motor oil to their diesel, which they believe improved their mileage. However, it is important to note that mixing diesel with other substances may not be legal or recommended, as it could void warranties or cause engine issues.
Overall, while the colour of diesel fuel is an important indicator of its tax status and intended use, it does not appear to have a direct impact on mileage. Mileage is influenced by various factors such as engine efficiency, driving habits, road conditions, and fuel quality. While some users have reported differences in mileage with differently coloured diesel fuels, these observations may be influenced by other factors and may not be solely attributed to the colour of the diesel.
To optimise mileage when using diesel fuel, it is essential to choose the appropriate type of diesel for your vehicle, follow recommended maintenance procedures, and drive efficiently. Additionally, ensuring that your vehicle is well-maintained and using high-quality fuel can also contribute to maximising mileage.
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The cause of diesel discolouration
The discoloration of diesel depends on its stability, which is primarily determined by its chemical composition and storage conditions. Straight-run diesel oil, for example, has good stability due to its low olefin content. However, diesel fuel can degrade over time, leading to changes in color. This degradation can be caused by oxidation, hydrolysis, or acidic byproducts of microbial contamination.
One of the most common causes of diesel discoloration is the growth of algae. Biodiesel, which is made from plant matter, provides a good environment for algae growth. Additionally, the removal of sulfur from diesel fuel has further contributed to the problem by reducing the fuel's ability to prevent algae growth. As a result, diesel fuel can turn a dark greenish or navy blue color, as some users have reported.
To prevent diesel fuel from degrading and changing color, it is recommended to treat it with stabilizers, remove free water phases from the tank bottom, and use biocides to kill any microbial contamination early on. Preventative measures are critical, as it is more costly to fix the problems caused by degraded fuel.
In addition to algae growth, other factors can also contribute to diesel discoloration. For example, the presence of high molecular weight hydrocarbons can lead to darker-colored compounds. On the other hand, lighter hydrocarbons like methane and #1/#2 diesel fuel are colorless or much lighter in color.
While diesel discoloration can be unsightly, it is important to note that it may also indicate underlying issues with fuel quality or storage conditions. Therefore, it is essential to take preventative measures and address any signs of degradation promptly.
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The legality of using differently coloured diesel
The colour of diesel fuel varies depending on its composition and intended use. While petroleum diesel, also known as fossil diesel, is typically derived from distilling crude oil, other types of diesel, such as biodiesel and dyed diesel, have different characteristics and legal considerations.
Red Diesel
Red diesel, also known as gas oil, is a type of dyed diesel that is commonly used in off-road vehicles and machinery. Its distinctive red colour is due to the addition of a red dye and chemical markers before sale, making it easily detectable. While it is illegal to use red diesel in on-road vehicles in the UK and the US, there are some exceptions. For example, in the UK, farmers are permitted to use red diesel for travelling between their own plots of land within a maximum distance of 1.5 km. Similarly, vehicles constructed or adapted specifically for gritting public roads are allowed to use red diesel. However, these exceptions may change over time as governments update legislation to encourage the use of low-emission fuels.
Green Diesel
Green diesel is a term used to describe ecologically friendly diesel that is clear in colour. Unlike red diesel, green diesel is not actually dyed green. This type of diesel is often sought after by drivers due to its environmental benefits.
Biodiesel
Biodiesel, derived from plant matter, is prone to algae growth due to its high biodegradability. While biodiesel may be considered a more sustainable alternative to petroleum diesel, its propensity for algae growth can impact fuel quality and engine performance.
Legal Considerations
It is important to note that the regulations surrounding diesel colours can change over time, and it is the responsibility of diesel users to stay informed about the latest legislation in their respective regions.
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Frequently asked questions
The color of diesel fuel can vary from clear to light green to dark green and even blue, yellow, or red. The different colors of diesel fuel are due to the dyes put in them. Light green diesel is typically used for highway use and is taxable.
Yes, it is normal for diesel fuel to be light green. However, the color of diesel fuel can vary depending on the region and the feedstock it was made from.
Diesel fuel can turn dark green due to algae growth. The sulfur in diesel fuel used to prevent algae growth, but the government removed it, allowing algae to grow and reducing the lubricity of the fuel.
