10 Best Diesel Oil Additives 2025 in the United States

The Archoil AR6500 Diesel Treatment is designed to enhance the performance and longevity of diesel engines. One of its primary strengths is its wide-ranging applicability, as it is suitable for all diesel vehicles. A single 40.6 oz bottle can treat up to 400 gallons, making it cost-effective for frequent use. This additive includes a blend of detergents, cetane boosters, lubricity enhancers, anti-gel agents, corrosion inhibitors, and stabilizers, addressing multiple key specs necessary for maintaining modern diesel engines.

The product is particularly notable for its ability to clean the post-combustion system, including components like the turbo and Diesel Particulate Filter (DPF), which can help prevent premature failures and reduce the frequency of regeneration cycles. On the downside, some users might find the initial cost high, but considering its effectiveness and the volume it treats, it could be a valuable investment for those looking to maintain their diesel engines over the long term. The product’s robust formulation also ensures that the fuel system, including high-pressure common rail (HPCR) systems, is cleaned, lubricated, and protected.

In summary, the Archoil AR6500 is a comprehensive diesel treatment that excels in enhancing engine performance, fuel economy, and system longevity, making it a worthwhile choice for diesel vehicle owners.

The Archoil Diesel Fuel System Kit combines two products: the AR6500 Diesel Treatment and the AR6400-D Diesel Fuel System Cleaner, making it a solid choice for diesel vehicle owners looking to maintain and enhance their engine performance. One of its strong points is its ability to restore key components of the fuel system, such as injectors and turbo, which is essential for keeping your vehicle running smoothly. The inclusion of cetane boosters is a great feature, as it can lead to improved engine performance and better fuel economy.

However, there are some limitations to be aware of. While it does a good job for regular maintenance, it's important to note that the AR6400-D is not intended to address HEUI injector stiction issues. For that, users need to look for the AR9100 Friction Modifier, which means that this kit may not cover all possible diesel engine problems. Additionally, while some users may find the products effective, others might expect more comprehensive solutions, particularly for older or heavily used vehicles.

The Archoil Diesel Fuel System Kit serves as a reliable option for those aiming to improve and maintain their diesel engines, particularly focusing on routine maintenance and performance enhancement. Nonetheless, for specific problems like injector stiction, additional products may be necessary to fully address those concerns.

The Archoil Ultimate Diesel Kit is a convenient package combining three popular additives designed to improve diesel engine performance and fuel quality. It includes a friction modifier, a diesel treatment, and a fuel system cleaner, addressing multiple important functions like cleaning, protecting, and boosting your fuel. The diesel treatment is especially notable since it can treat up to 400 gallons and is recommended at every fill-up, helping maintain consistent engine efficiency and fuel stability.

The kit offers detergents to clean deposits, cetane boosters to improve combustion, and lubricity enhancers to reduce engine wear. Users also benefit from additives that prevent corrosion and help stabilize fuel, which is important for protecting the engine over time. One strength is its high user rating and popularity in the diesel additive category, reflecting customer satisfaction. However, the kit’s price and volume might be more than what casual or occasional diesel users need, making it better suited for regular diesel vehicle operators or those running larger fleets.

Though it doesn't specifically mention anti-gel agents, the combination suggests good fuel system care, especially in varying temperatures. This kit represents a solid choice if you want a comprehensive, easy-to-use solution to keep your diesel engine running smoothly and efficiently.