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.

The Liqui Moly Super Diesel Additive is designed to improve your diesel fuel’s performance by boosting the cetane number, which helps your engine run smoother and start easier. It also acts as a lubricity enhancer, protecting parts like injectors from wear and extending their life. The additive helps keep the entire fuel system clean by preventing deposits and buildup in combustion chambers and injectors, which can improve fuel efficiency and reduce maintenance needs. It contains antioxidants that fight corrosion inside the fuel system, helping to prevent damage over time.

While it doesn’t specifically list anti-gel properties, Liqui Moly products are generally known for stabilizing fuel, which can help in cold conditions to some extent. One strong point is the positive customer feedback, with a high rating and many users praising its effectiveness. Since this is a pack of 20 bottles, it’s better suited for frequent users or fleet operators rather than occasional drivers. It may also be a bit heavy and bulky to store given the package size.

If you want a reliable additive that covers most of the important functions like cleaning, lubricating, and stabilizing your diesel fuel, this product represents a solid choice. Be sure to consider the quantity and storage needs before purchasing.