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.

Power Service Diesel Kleen + Cetane Boost is a versatile diesel additive designed to improve fuel performance across all diesel vehicles. It effectively cleans dirty fuel injectors and prevents injector sticking, helping maintain engine efficiency and longevity. One of its key strengths is boosting the cetane number by up to 6 points, resulting in smoother engine operation, reduced power lag, and quicker cold starts — important benefits for diesel engines, especially in colder climates.

This additive works well with all types of diesel fuel, including ultra-low sulfur diesel and biodiesel blends, making it a universal fit for various diesel vehicles. It also offers additional benefits such as improving fuel lubricity, which protects engine parts, and stabilizing the fuel to prevent issues during storage. The flash point of 49°C means it should be handled with some care to avoid safety risks.

Customer feedback is very positive, with high ratings emphasizing reliability and effectiveness. This additive is well suited for diesel vehicle owners looking for a comprehensive fuel treatment that enhances engine cleanliness and performance, though those specifically needing strong anti-gel protection might want to confirm its cold-weather performance separately.

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.