10 Best Diesel Additives 2025 in the United States

Hot Shot's Secret Everyday Diesel Treatment in a 16-ounce squeeze bottle offers several strong features that cater to diesel engine needs. It effectively boosts cetane by up to 7 points, which can enhance power, performance, and fuel economy. This is a significant advantage for those looking to improve their diesel engine's efficiency and performance.

The product also stabilizes fuel and disperses moisture, which helps prevent issues related to fuel degradation and water contamination, ensuring smoother engine operation. Additionally, it increases lubricity, which reduces wear and tear on engine components and prevents rust and corrosion, extending the engine's life.

Hot Shot's Secret Everyday Diesel Treatment is particularly beneficial for those seeking improved engine performance, fuel stabilization, and protection against rust and corrosion.

The Hot Shot's Secret LX4 Lubricity Extreme is a versatile diesel additive that shines in enhancing engine performance and extending the life of fuel systems. Its ability to increase fuel lubricity by up to 56% is a standout feature, providing critical protection against wear and tear on fuel pumps and injectors, especially in ultra-low sulfur diesel (ULSD) environments. This is particularly beneficial for users looking to maintain their vehicles in optimal condition, whether they drive gasoline or diesel engines. The product is designed to lubricate upper cylinders and other vital components, effectively reducing friction and improving engine performance. Plus, it’s easy to use—with just 1 ounce of LX4 for every 10 gallons of fuel, it integrates seamlessly into regular fueling routines.

While the LX4 is safe for all engine types, it may be less effective in very harsh fuel conditions or extreme temperatures. It acts as an excellent lubricant, but it may not provide the complete range of benefits seen in other specialized additives, such as comprehensive injector cleaning or anti-gel properties. Users who frequently operate in extreme cold may need to look for additives specifically designed to prevent fuel gelling.

For those looking to enhance engine performance, protect their fuel systems, and simplify maintenance, Hot Shot's Secret LX4 is a strong contender in the diesel additive category. However, if your vehicle operates under very harsh conditions or extreme temperatures, you might want to consider additional options to fully meet your needs.

The SeaFoam SF-16 Motor Treatment is a popular choice in the automotive market. This product comes in a convenient pack of three 16 oz. cans, making it easy to use and store. It ranks #2 in Fuel System Tools on Amazon.

This treatment can be particularly beneficial for those looking to clean and lubricate fuel systems, stabilize fuel, and improve engine performance. It is versatile and can be used in both diesel and gasoline engines, making it a handy option for a wide range of vehicles.

The product’s strength lies in its ability to clean injectors and improve lubricity, which can lead to smoother engine performance and longevity. For users specifically seeking anti-gel properties or cetane improvement, additional products may be required. The SeaFoam SF-16 is a reliable fuel treatment option, particularly strong in cleaning and lubricating fuel systems, with some limitations regarding specialized diesel additive features.