10 Best Diesel Engine Fuel Additives 2025 in the United States

Hot Shot's Secret Everyday Diesel Treatment is a well-regarded product in the diesel-engine-fuel-additives category. One of its standout features is its ability to boost cetane ratings by up to 7 points, which can significantly enhance engine performance, power, and fuel economy. This product also excels in increasing lubricity, which helps prevent rust and corrosion, hence extending the longevity of engine components.

Its anti-gel additives make it particularly useful in colder climates, ensuring that diesel fuel doesn't thicken and cause starting issues. Additionally, the treatment stabilizes fuel and disperses water, reducing the risk of fuel system contamination and wear. The product might be more expensive than some other options on the market, which could be a concern for budget-conscious buyers. Also, while it addresses a wide range of common diesel fuel issues, those with specialized needs might still require additional treatments.

Given its comprehensive benefits and positive reception, this additive is a solid choice for diesel engine maintenance.

Hot Shot's Secret LX4 Lubricity Extreme is a diesel-engine-fuel-additive designed to enhance the performance and longevity of your engine. It significantly boosts fuel lubricity, which is crucial for protecting fuel pumps and injectors from wear and tear, especially in Ultra Low Sulfur Diesel (USLD) fuels. This additive works well with both gasoline and diesel engines, making it a versatile option for various vehicle types.

Users appreciate its ease of use; just add 1oz per 10 gallons of fuel, and you’re good to go. It's particularly noted for extending fuel system life and maintaining a smoothly running engine. However, it lacks specific features like cetane number improver and anti-gel additives, which are important for some users.

While it is safe and effective for regular use, the absence of these features may limit its appeal for those in colder climates or seeking a comprehensive additive solution. It comes in a 1-gallon bottle, providing ample supply for frequent use. If your primary need is to enhance lubricity and protect your engine components, this product could be a worthwhile investment. However, if you require a more all-encompassing fuel additive, you might need to look elsewhere.

The Power Service 1025-12PK +Cetane Boost Diesel Fuel Supplement is designed to help diesel engine users, especially in colder climates, by preventing fuel gelling and fuel-filter icing, which are common winter problems. It effectively boosts the cetane number, helping engines start more easily in cold weather. This product also includes a lubricity enhancer that protects fuel pumps and injectors from wear caused by low-quality Ultra Low Sulfur Diesel (ULSD) fuel, which is a helpful feature for maintaining engine health.

Additionally, it works well with all diesel fuel types, including biodiesel blends, making it versatile for various users. While it does not specifically highlight injector cleaning or water dispersant capabilities, its formulation is known to stabilize fuel and reduce moisture-related issues indirectly. Packaged as a 12-quart set, it offers good value for those who regularly treat their fuel.

The product focuses primarily on cold weather performance and lubricity. If injector cleaning is a top priority, additives specialized in that area might be considered. With strong customer ratings and a solid reputation, this supplement is a reliable choice for diesel owners looking to enhance cold start performance and protect fuel system components.