10 Best Diesel Fuel Additive 2025 in the United States

The Archoil AR6500 Diesel Treatment is designed to enhance diesel fuel performance by addressing several important factors. It provides a strong boost in cetane number, which can help improve engine power and throttle response, making it suitable for drivers who want smoother and more efficient combustion. This additive also cleans and lubricates the fuel system, which is especially beneficial for modern diesel engines with high-pressure common rail (HPCR) systems that can be sensitive to deposits and wear.

Additionally, it acts as a stabilizer and helps separate water from fuel, protecting the engine from corrosion and fuel degradation over time. Sold as a two-pack treating up to 800 gallons, it offers good value for regular maintenance. The product does not explicitly mention anti-gel properties, so those in very cold climates might consider using a dedicated anti-gel additive alongside it.

This treatment is a solid choice for anyone looking to improve fuel efficiency, protect their injection system, and maintain clean fuel lines in all types of diesel vehicles.

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.

Hot Shot's Secret Everyday Diesel Treatment is a versatile 6-in-1 additive designed to keep diesel engines running smoothly and efficiently. Its main strength lies in boosting cetane levels by up to 7 points, which helps improve fuel economy and reduces engine noise and rough idling. The treatment also cleans fuel injectors, removing deposits that can harm engine performance, while enhancing fuel lubricity to protect sensitive parts like pumps and injectors from wear.

It acts as a water demulsifier, separating moisture from fuel to prevent freezing and gelling during cold weather, and stabilizes fuel to reduce oxidation and degradation over time. Additionally, it helps prevent rust and corrosion inside the fuel system, supporting longer engine life. Application is straightforward—just add 1 or 2 ounces per 25 gallons of diesel at every fill-up, making it easy to maintain consistent benefits.

Many users praise its effectiveness and reliability, though some may find the need for regular use a minor inconvenience, and as with most additives, results can vary depending on fuel quality and engine condition. This product is a solid choice for diesel vehicle owners who want to maintain engine health, improve fuel efficiency, and avoid costly repairs, especially in varying climates where fuel stability and engine protection are important.