10 Best Diesel Fuel Additives 2025 in the United States

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 designed to improve the performance and lifespan of diesel engines by addressing several critical functions. It offers a strong cetane number boost, which helps diesel fuel ignite more efficiently, leading to better engine power and throttle response. This additive also lubricates and protects the fuel system, including sensitive high-pressure common rail (HPCR) components, which can reduce wear and extend engine life. A standout feature is its ability to clean the post-combustion parts like turbos and diesel particulate filters (DPF), potentially preventing costly failures and reducing how often regeneration cycles occur.

The treatment ratio is convenient, with one 40-ounce bottle treating up to 400 gallons of diesel, making it easy to use regularly at every fill-up without dosing guesswork. It also helps maintain fuel system cleanliness and may improve fuel economy by restoring performance lost to deposits.

With high customer ratings and a solid reputation as a top diesel additive, this product is well-suited for diesel vehicle owners who want a comprehensive, maintenance-focused additive to improve combustion, protect key components, and keep injection systems clean. It fits best for those regularly using diesel fuel and looking to preserve engine health and efficiency rather than just a quick fix for cold weather or lubrication alone.

Hot Shot's Secret Diesel Extreme is a concentrated diesel fuel additive that primarily excels at cleaning your fuel system and injectors. It effectively removes internal and external injector deposits, helping your engine run smoother and potentially improving mileage. One of its strong points is boosting the cetane number by up to 7 points, which means cleaner, more efficient combustion and a possible increase in engine power. This additive also includes rust and corrosion inhibitors and acts as a water dispersant, which helps protect your fuel system from moisture-related issues. Its treatment ratio is convenient—8 ounces treats 20 gallons of diesel, making it easy to use during regular fill-ups or every 6,000 miles.

The product is unscented and liquid form, and it is well-regarded by customers with generally positive feedback. This additive is best suited for diesel vehicle owners looking for a reliable injector cleaner and fuel system protector that also raises cetane levels, improving engine performance and fuel economy.