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.

Archoil AR6500 Diesel Treatment is a versatile additive suitable for all diesel vehicles. A 40.6 oz bottle can treat up to 400 gallons of fuel, making it a cost-effective option for frequent use. One of its primary strengths is its ability to clean the post-combustion system, including turbos and DPFs, which can prevent premature failures and reduce the frequency of regenerations. This feature is particularly beneficial for maintaining the longevity and efficiency of diesel engines.

Additionally, it incorporates a strong cetane booster, which can improve power and responsiveness, giving your vehicle a noticeable performance boost. The additive also excels in cleaning, lubricating, and protecting the entire fuel system, including high-pressure common rail (HPCR) systems, which are prone to deposits and wear.

Archoil AR6500 is a robust choice for those looking to enhance engine performance and protect their fuel systems, especially for users prioritizing power, response, and post-combustion cleaning.