10 Best Diesel Additives 2025 in the United States

The Archoil AR6500 Diesel Treatment is a solid choice for anyone looking to improve the performance and protection of their diesel fuel system. It combines multiple benefits in one product, including a strong cetane boost that helps your engine start easier and run smoother by improving fuel combustion. It also cleans and lubricates the fuel system, which is important for maintaining injectors and high-pressure common rail (HPCR) systems, potentially preventing costly repairs.

Additionally, it’s formulated to handle modern diesel fuel challenges, which can include issues like fuel gelling in cold weather and water contamination, thanks to its ability to stabilize fuel and disperse water. The fact that this two-pack treats up to 800 gallons makes it a good value for those who want to maintain their diesel vehicles regularly. The product is somewhat heavier and larger than some other additives, which could be less convenient if you prefer smaller bottles for storage.

With positive feedback from many users, this treatment is well-suited for diesel vehicle owners who want an all-in-one additive that improves power, protects fuel systems, and enhances fuel stability without having to buy multiple products.

Hot Shot's Secret Everyday Diesel Treatment is a versatile 6-in-1 additive designed to keep diesel engines running smoothly. It combines essential features such as cetane boosting, injector cleaning, fuel stabilization, anti-gel properties, lubricity improvement, and water dispersing. This means it not only helps your engine start easier and run more efficiently by increasing cetane levels (which improves fuel burn), but also protects key parts like injectors and fuel pumps from deposits and wear.

Its fuel stabilizer qualities prevent fuel breakdown and moisture damage, reducing rust and corrosion inside the fuel system. The product is straightforward to use—just add a small amount during each fill-up—which makes it convenient for daily maintenance. Customers consistently praise its effectiveness and note improved fuel economy and engine performance. On the downside, while it covers many bases, it may not replace specialized additives if you face extreme conditions like severe cold where stronger anti-gel solutions are needed. Also, its larger size and weight could be less convenient for occasional users who want something more portable.

For diesel vehicle owners looking for an all-in-one additive that supports engine health, enhances fuel efficiency, and protects fuel system components, this treatment provides a solid choice that balances quality and ease of use.

The Stanadyne Performance Formula Diesel Fuel Additive is a comprehensive product for diesel engine maintenance, available in a case of 12 bottles, each 16 ounces. It is designed to address various aspects of diesel fuel quality and engine performance. One of its key strengths is its ability to restore and increase horsepower by cleaning deposits in the injection system. This can lead to noticeable improvements in engine performance and efficiency, with tests indicating up to a 9.6% gain in fuel mileage and an average of 4% improvement overall.

The cetane improver is a significant feature, enhancing combustion for better engine starting, smoother running, and reduced noise levels. Additionally, the additive contains lubricity improvers which are essential for protecting and reducing wear in engines running on ultra-low sulfur diesel fuels. This can be particularly beneficial for extending engine life and maintaining efficiency. The product also helps reduce emissions, including smoke and particulates, making it an environmentally friendly choice.

Another notable feature is its ability to disperse water using special demulsifiers, improving fuel filter effectiveness and preventing water-related issues. This additive is particularly useful for those using ultra-low sulfur diesel and biodiesel blends up to B20. In summary, the Stanadyne Performance Formula Diesel Fuel Additive offers a robust set of features aimed at enhancing diesel engine performance, efficiency, and longevity, while also addressing environmental concerns.