10 Best Diesel Fuel Additive 2025 in the United States

The Archoil AR6500 Diesel Treatment is designed to improve diesel fuel performance and protect your engine, making it a solid choice for anyone using diesel vehicles. It comes in a 40-ounce bottle that treats up to 400 gallons of fuel, so adding it at each fill-up is easy and convenient. One of its standout features is the ability to clean not just the fuel system but also the post-combustion parts like the turbocharger and diesel particulate filter (DPF), which can help prevent costly repairs and reduce how often your vehicle needs regeneration.

This additive also boosts the cetane number, which means your engine runs smoother and responds better. It lubricates the fuel system to reduce wear and helps stabilize fuel while separating water, which protects against damage and improves fuel efficiency. Users appreciate its effectiveness, reflected in high customer ratings.

While it offers broad protection and performance improvements, it may be priced higher than some basic additives, and for very old or heavily contaminated engines, it might not fully restore performance on its own. For modern diesel vehicles, this additive delivers multiple benefits in one bottle, making it a practical and reliable choice.

The Hot Shot's Secret Everyday Diesel Treatment is designed to enhance the performance of diesel engines. One of its standout features is the ability to boost cetane numbers by up to 7 points, which can significantly improve engine power, performance, and fuel economy. This makes it an ideal choice for those looking to get the most out of their diesel engines, whether for everyday use or heavy-duty applications. The additive also increases lubricity, helping to prevent rust and corrosion, which is crucial for maintaining the longevity of engine parts.

Another noteworthy feature is its ability to stabilize fuel and disperse moisture, preventing common issues such as fuel gelling in cold temperatures and water contamination. The inclusion of a detergent additive ensures that the fuel system stays clean, promoting better engine efficiency and reducing the risk of deposits that can hinder performance. However, some users may find the price point a bit high compared to other diesel additives on the market. Additionally, the 16-ounce bottle may not be sufficient for larger fuel tanks, requiring more frequent purchases.

Despite these minor drawbacks, this additive ranks #1 in Diesel Additives and has a strong reputation for quality and efficacy. It is a reliable option for diesel engine owners seeking a comprehensive treatment to enhance their vehicle's performance and longevity.

The Power Service 1025-12PK +Cetane Boost Diesel Fuel Supplement is a solid choice for anyone using diesel engines, particularly in colder climates. Its key feature is the cetane number improver, which enhances fuel combustion, leading to quicker cold starts – a significant advantage during winter months. Additionally, the anti-gel additive helps prevent fuel gelling, ensuring smooth engine operation even in freezing conditions. This product also includes a lubricity enhancer that protects essential components like fuel pumps and injectors from wear, especially when using lower-quality Ultra Low Sulfur Diesel (ULSD).

The detergent additive works to keep the fuel system clean, which can improve engine performance and longevity. Another beneficial aspect is its compatibility with various diesel fuels, including biodiesel blends, making it versatile for different users.

There are a few considerations to keep in mind. Although it's effective in preventing fuel-filter icing, some users may find that the results vary based on the specific fuel quality and environmental conditions. Moreover, this product comes in a pack of 12 quarts, which might be more than what casual users need, potentially leading to excess supply if not used regularly.