10 Best Fuel Additives 2026 in the United States

The Lucas Oil Fuel Additive is designed to clean and lubricate the fuel system of both diesel and gasoline vehicles, making it a versatile choice for car and truck owners. It claims to neutralize issues caused by low sulfur fuels, which can be a problem in modern fuels, and helps improve engine power and fuel efficiency by reducing exhaust emissions. The additive also aims to extend the life of critical engine parts like pumps and injectors by providing extra lubrication.

Packaged in a convenient 1-gallon jug and sold in a set of four, it offers good value for those who regularly maintain their vehicles. Lucas Oil is known for its strong reputation in automotive products and has a solid presence in the fuel additive market. The product uses a universal formula intended to work with all gasoline and diesel engines, which is great for general use but may not be tailored for specific engine types or conditions. The dosage instructions should be followed carefully to avoid overuse, as with any additive.

This additive is a solid pick if you want to maintain engine health and improve fuel economy without dealing with complex product choices.

The Chevron 65740-CASE Techron Concentrate Plus Fuel System Cleaner is a highly rated fuel additive designed to clean and protect the entire fuel system, including fuel injectors, carburetors, intake valves, and combustion chambers. It is suitable for various fuel types, and users can find more specific recommendations in the vehicle owner's manual. The product claims to restore lost power and fuel economy, reduce engine issues like rough idling and hesitation, and improve cold start performance.

Additionally, it enhances fuel stability for up to a year, making it a versatile additive for maintaining engine health. This pack of six 20 oz. bottles is an economical choice for regular maintenance. The product is made in the USA. Users should be mindful of the concentration and dosage instructions to avoid potential engine damage. The long-standing reputation of the Chevron brand in the automotive industry adds to its credibility.

While the benefits are clear, the product's efficacy may vary depending on individual vehicle conditions and usage patterns.

The Red Line 60103 SI-1 Complete Fuel System Cleaner is a well-regarded option for those looking to maintain their vehicle's fuel system. One of its standout features is its ability to clean injectors, carburetors, and combustion chambers effectively, thanks to its powerful blend of detergents. This makes it particularly useful for drivers who want to enhance engine performance and ensure a smoother drive. Its ease of use—just one bottle per tank—adds to its appeal, making it convenient for regular maintenance.

The additive is designed to improve fuel stability and significantly reduce the buildup of harmful deposits such as gum and varnish. For users who prioritize the longevity of their fuel system and are keen on preventing corrosion, this product fits the bill well.

Potential buyers should note that while it claims to provide nearly 100% cleaning efficiency in one treatment, results can vary based on the condition of the vehicle's fuel system. Those with older models or significant buildup may require repeated treatments for optimal results.