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 LX4 Lubricity Extreme is a versatile diesel fuel additive designed to enhance engine performance and protect fuel systems in both gasoline and diesel engines. One of its standout features is the ability to increase fuel lubricity by up to 56%, which helps prevent wear on critical components like fuel pumps and injectors. This protection is especially beneficial for users dealing with Ultra Low Sulfur Diesel (USLD), as it restores lubricity that may be lacking in modern fuels.

Another strength lies in its multi-functional capabilities. LX4 not only lubricates the upper cylinder but also acts as a water demulsifier and detergent additive, helping to keep the fuel system clean and free from water-related issues. This blend of features makes it an excellent choice for individuals looking to extend the life of their engines and fuel systems while maintaining optimal performance.

Users will appreciate how easy it is to incorporate the product into their routine—just one ounce per ten gallons of fuel is all that's needed for effective treatment. Given its zero harmful ingredients, it's a safe choice for all engine types, which is a significant advantage for those who may have concerns about additives harming their vehicles.