Diesel fuel is commonly used in various applications, such as trucks, buses, generators, and heavy equipment, due to its high energy density and efficiency. 

However, diesel fuel is prone to gelling in cold weather, which can lead to engine problems and downtime. One way to prevent gelling is by using anti-gel additives, but how much should be used? 

In this article, we will provide some guidelines and tips for using anti-gel additives and maintaining diesel fuel in cold weather.

How Much Anti-Gel Should be Added Per Gallon of Diesel?

The amount of anti-gel additive to use per gallon of diesel can vary depending on the product and the severity of the cold weather. Generally, most anti-gel additives recommend a dosage of 1:1000 to 1:2000, which means one part of additive per 1000 or 2000 parts of diesel fuel. 

For example, if you have a 20-gallon fuel tank, you may need to add 10 to 20 ounces of anti-gel additive. 

However, it is important to follow the manufacturer’s instructions and recommendations for the specific product you are using. 

Some anti-gel additives may require a higher or lower dosage depending on their formulation and the expected temperature range. It is also important to note that adding too much anti-gel additive can have negative effects on fuel quality and performance, as we will discuss later.

What Causes Diesel Fuel to Gel in Cold Weather?

Diesel fuel is a complex mixture of hydrocarbons that can vary in composition depending on the source and refining process. One of the components of diesel fuel is paraffin wax, which has a high melting point and can solidify at low temperatures. 

When the temperature drops, the paraffin wax in diesel fuel can form crystals that clog fuel filters and reduce fuel flow, causing engine hesitation or failure. This phenomenon is known as gelling, and it is a common problem in cold weather.

You Can See:

Why is Anti-Gel Important?

Anti-gel additives are chemical compounds that can modify the properties of diesel fuel to prevent gelling. Most anti-gel additives contain polymers or other substances that can disperse the wax crystals and keep them in suspension, allowing the fuel to flow more freely. Anti-gel additives can also lower the pour point of diesel fuel, 

Which is the temperature at which the fuel starts to solidify. By using anti-gel additives, diesel fuel can remain liquid and flowable even at very low temperatures, ensuring reliable engine performance.

Factors to Consider When Choosing Anti-Gel Additives

Not all anti-gel additives are created equal, and it is important to choose the right product for your specific needs and conditions. Some factors to consider when selecting an anti-gel additive include:

  • Temperature range: Different anti-gel additives have different effectiveness at different temperature ranges. Make sure to choose a product that is suitable for the lowest expected temperature in your area.
  • Compatibility with fuel: Some anti-gel additives may not be compatible with certain types of diesel fuel or biodiesel blends. Check the product label or consult with the manufacturer to ensure compatibility.
  • Chemical composition: Some anti-gel additives may contain harmful chemicals or compounds that can damage engine components or emissions control systems. Look for products that are safe and approved for use in diesel engines.
  • Price and availability: Anti-gel additives can vary in price and availability depending on the brand, size, and seller. Consider your budget and convenience when choosing a product.

Other Tips for Cold Weather Diesel Maintenance

While anti-gel additives can be effective in preventing gelling, they are not the only solution to cold-weather diesel maintenance. Here are some additional tips to keep in mind:

Use High-Quality Fuel

Using high-quality diesel fuel can reduce the risk of gelling and improve engine performance. Look for fuel that meets the industry standards and specifications, such as ASTM D975 or EN 590. Avoid using old or contaminated fuel, which can contain water, sediment, or microorganisms that can cause fuel system problems.

Keep Fuel Tanks Full

Keeping the fuel tanks full can help prevent condensation and water buildup, which can contribute to fuel contamination and gelling. Try to keep the tanks at least half full at all times, especially during periods of low usage or storage.

Insulate Fuel Tanks and Lines

Insulating the fuel tanks and lines can help retain the heat generated by the engine or external heaters, reducing the risk of gelling. Use appropriate insulation materials and methods that are safe and effective for your specific application.

Install Block Heaters

Block heaters are electric heaters that can be installed on the engine block to preheat the coolant and engine components before starting. This can reduce engine wear and tear, improve fuel efficiency, and prevent gelling.

Use Fuel Additives Carefully

While anti-gel additives can be useful in preventing gelling, other fuel additives may not be necessary or beneficial for your engine. Some additives can cause deposits, corrosion, or other problems that can reduce engine performance and durability. Consult with a diesel mechanic or fuel expert before using any fuel additives.

How Much Anti-Gel in Diesel Per Gallon


What is the Best Anti-Gel Additive for Diesel Fuel?

The best anti-gel additive for diesel fuel depends on several factors, such as the expected temperature range, the type of diesel fuel, and the specific application. Consult with the manufacturer or a fuel expert to determine the best product for your needs.

Can Too Much Anti-Gel be Added to Diesel Fuel?

Yes, adding too much anti-gel additive can have negative effects on fuel quality and performance. Excessive amounts of anti-gel additives can lead to fuel thickening, reduced fuel economy, and increased emissions. Follow the manufacturer’s instructions and dosage recommendations for the specific product you are using.

How Often Should Anti-Gel Additive Be Used?

The frequency of anti-gel additive used depends on the expected temperature range and the usage pattern of the vehicle or equipment. In general, it is recommended to use anti-gel additives every time you fill up the fuel tank during the cold season. However, if the temperature is mild or the vehicle is used frequently, you may be able to use it less frequently.

Can Anti-Gel Additives Affect Fuel Economy?

Yes, some anti-gel additives can affect fuel economy by reducing the energy content of the fuel or altering the combustion characteristics. However, the effect on fuel economy is usually small and may be offset by the benefits of preventing gelling and engine problems. Look for products that are specifically designed to minimize the impact on fuel economy.

Can Anti-Gel Additives Cause Engine Damage?

In general, anti-gel additives are safe and approved for use in diesel engines. However, some products may contain harmful chemicals or compounds that can damage engine components or emissions control systems if used improperly or excessively. Follow the manufacturer’s instructions and recommendations, and consult with a diesel mechanic or fuel expert if you have any concerns.

Diesel Fuel Supplement (Anti-Gel)


Maintaining diesel fuel in cold weather can be challenging, but using anti-gel additives and following proper maintenance practices can help prevent gelling and ensure reliable engine performance. When choosing an anti-gel additive, consider the temperature range, fuel compatibility, chemical composition, price, and availability. 

Remember to use additives and other maintenance practices carefully and according to the manufacturer’s recommendations. By taking these steps, you can enjoy the benefits of diesel fuel without the hassle of gelling.

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *