10 Best Diesel Fuel Additives 2026 in the United States

The Red Line 60103 SI-1 Complete Fuel System Cleaner is a concentrated additive designed mainly to clean and protect fuel systems by removing deposits from injectors, carburetors, valves, and combustion chambers. It excels in detergency, efficiently cleaning nearly all buildup with just one 15-ounce bottle per tank.

While it’s highly rated for cleaning and preventing corrosion, this product is primarily formulated for gasoline engines, so it may not be specifically tailored for diesel fuel needs such as cetane number improvement or anti-gel properties, which are critical in diesel additives. It does help stabilize fuel and reduce gum and varnish, which supports fuel efficiency and engine performance.

There’s no clear indication that it improves lubricity or disperses water, both important for diesel engine health. The pack of 12 offers good value if frequent treatments are needed. This cleaner is best suited for users looking to maintain and improve their gasoline engine’s fuel system cleanliness rather than those needing comprehensive diesel-specific fuel additive features.

Hot Shot's Secret Everyday Diesel Treatment is a versatile diesel additive designed to keep your engine running smoothly on a daily basis. One of its main strengths is boosting the cetane number by up to 7 points, which helps your diesel engine ignite fuel more efficiently. This can lead to better fuel economy and improved acceleration, making it a good choice if you're looking to enhance performance and reduce fuel costs.

It also acts as a fuel injector cleaner, removing deposits that can clog injectors, and improves fuel lubricity to protect vital parts like pumps and injectors from wear. This helps maintain engine health and can potentially extend the life of your fuel system. The product offers protection against rust and corrosion by removing moisture and stabilizing the fuel, which is important for preventing damage over time, especially if you live in a humid area or use your vehicle infrequently.

This additive is easy to use, with a recommended dose of 1 to 2 ounces per 25 gallons of diesel, suitable for regular use at every fill-up. It serves as an excellent choice for everyday maintenance and improving engine efficiency, though users in freezing climates may need to consider additional products for specialized cold weather protection.

The Archoil AR6500 Diesel Treatment is a versatile additive designed to improve several aspects of diesel fuel performance. It increases cetane numbers by up to 8 points, helping engines start more easily and run smoother, especially with lower cetane rating fuels. It also enhances lubricity significantly (tested to 43%), which protects sensitive fuel system components like the CP4 pump from wear and extends their lifespan.

This additive features a powerful detergent package that cleans fuel injectors, restoring proper spray patterns and improving fuel economy and engine performance. Additionally, it supports diesel particulate filter (DPF) health by reducing deposit buildup and regeneration frequency, saving money on maintenance. It also helps keep turbochargers cleaner for better responsiveness and smoother acceleration.

The product comes in two 40 oz bottles, treating up to 800 gallons of diesel, making it convenient for regular use at each fill-up. It suits a wide range of diesel vehicles and equipment, from light-duty trucks to heavy machinery, and is especially beneficial for users aiming to improve engine efficiency, protect fuel system parts, and maintain emission components.