10 Best Diesel Fuel Additive 2026 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.

The Howes Diesel Treat 64-Ounce Anti-Gel and Diesel Fuel Lubricator is a versatile and reliable additive for diesel engines, particularly beneficial during the colder months. It excels in preventing fuel from gelling, making it a trusted choice for those in extremely cold climates. This product is also designed to enhance lubricity, which is crucial for the longevity and performance of diesel engines, especially given the challenges posed by Ultra Low Sulfur Diesel (ULSD) fuels. By adding lubricity, it helps protect injectors, pumps, and upper cylinders, potentially extending engine life and improving performance.

Additionally, Howes Diesel Treat boasts a detergent additive that tackles carbon deposits, which can degrade engine power and efficiency. This feature aids in maintaining optimal fuel economy and engine performance, providing a financial benefit over time. One of the standout features is its water demulsifier, which safely removes water from the fuel without using harmful alcohols or solvents. This helps prevent issues like fuel filter icing and further protects engine components.

However, the product is relatively lightweight at 0.01 ounces per bottle, which might seem confusing compared to its liquid volume of 64 fluid ounces. Potential buyers should also consider the storage space required for the casepack of six bottles. In conclusion, Howes Diesel Treat is a well-rounded diesel fuel additive that offers multiple benefits, particularly for those who frequently operate diesel vehicles in cold weather. It addresses key concerns like fuel gelling, lubricity, deposit prevention, and water removal, making it a comprehensive solution for maintaining diesel engine health and performance.