10 Best Diesel Fuel Additives 2025 in the United States

Hot Shot's Secret Everyday Diesel Treatment in a 16-ounce squeeze bottle offers several valuable benefits for diesel engine maintenance. This product is designed to boost the cetane number by up to 7 points, which can help improve combustion efficiency and result in better engine performance and fuel economy. The increase in power and performance is a notable strength, making it a suitable choice for those looking to get the most out of their diesel engines.

Additionally, it enhances lubricity, which is crucial for preventing wear and tear on engine components, and includes corrosion inhibitors to keep rust at bay, extending the lifespan of the engine and fuel system components. Another significant feature is its ability to stabilize fuel and disperse moisture, which helps prevent fuel degradation and the formation of harmful deposits, ensuring a cleaner and more efficient burning process.

This additive also functions as an anti-gel, making it suitable for use in colder climates where diesel fuel can thicken and clog the fuel system. It's worth noting that the boost in cetane and other benefits might not be as noticeable in all engines, and the cost might be a consideration for some users. It's also essential to follow the manufacturer's instructions for the best results. In summary, this product is highly effective for those wanting to maintain their diesel engines' health and efficiency, especially in varying temperatures and conditions.

Hot Shot's Secret Diesel Extreme is a comprehensive diesel fuel additive designed to address multiple key needs essential for engine maintenance and performance. One of its prominent strengths is the ability to significantly boost cetane levels by up to 7 points, which can improve combustion efficiency, fuel economy, and engine power. Additionally, it excels in cleaning fuel injectors and the entire fuel system, which helps prevent and eliminate various deposits, ensuring smoother engine operation and longevity.

The product also enhances lubricity, which is crucial for protecting critical engine components like valves, pumps, and pistons, reducing wear and tear over time. The inclusion of military-grade rust and corrosion inhibitors helps to stabilize the fuel and prevent rust, further contributing to engine reliability. The non-alcohol-based formulation is effective in dispersing moisture, thus mitigating potential fuel system issues. Moreover, its easy-to-use application method, requiring just 8 oz. per 20 gallons of fuel every 6,000 miles, makes it convenient for regular maintenance.

However, the product does not specifically mention anti-gel properties, which might be a concern for users in extremely cold climates. Hot Shot's Secret Diesel Extreme is well-suited for diesel vehicle owners looking to improve engine performance and maintain fuel system cleanliness, though they might need to consider additional anti-gel solutions if operating in very cold environments.

The Power Service Diesel Kleen + Cetane Boost is designed to enhance diesel fuel performance across various diesel vehicles, making it a solid choice for anyone looking to improve engine efficiency and reliability. One of its standout features is its ability to clean dirty injectors, which can significantly prevent injector sticking, especially in both modern HPCR systems and older diesel engines. Users can expect smoother engine operation, reduced power lag, and quicker cold starts thanks to the cetane boost of up to six numbers it provides. This enhancement can be particularly beneficial for those in colder climates or for users who often face starting difficulties during winter.

This diesel additive is compatible with all types of diesel fuels, including ULSD and biodiesel blends, which adds to its versatility. Its universal fit means it can be used across a broad range of diesel vehicles, appealing to both casual drivers and commercial users alike.

While the product shows impressive results, it comes in a relatively large 64oz bottle that might be cumbersome for some users. Additionally, the price could be a consideration for budget-conscious consumers, especially if they require frequent use. Although many find it effective, results can vary based on the specific condition and maintenance of the engine itself. Power Service Diesel Kleen + Cetane Boost is a powerful option for those looking to maximize their diesel fuel efficiency and engine performance, but potential customers should consider their usage frequency and budget before committing.