10 Best Fuel Additives 2025 in the United States

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 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 Techron Concentrate Plus is a liquid fuel system cleaner designed for gasoline engines in cars, trucks, motorcycles, boats, and other small engines. It is compatible with a wide range of gasoline-powered vehicles and recommends use every 3,000 miles or at oil changes for cars, while other gasoline engines can use it as needed. Its main strengths lie in its ability to clean and protect the entire fuel system, including fuel injectors and carburetors, which helps restore lost power and improve acceleration and fuel economy.

Many users report it reduces rough idling, engine hesitation, and spark plug fouling, while also enhancing cold start performance and fuel stability for up to one year. The product is well-regarded, holding a high customer rating of 4.6 out of 5 from over 15,000 reviews, and is produced by Chevron, a trusted brand in automotive products. The 12-ounce concentrate is easy to use, measuring straightforward dosage to suit various vehicle sizes.

While it is effective for cleaning and maintenance, it is not a fix for major engine problems or mechanical failures. Since it is intended for gasoline engines only, it is not suitable for diesel vehicles. This fuel additive serves as a reliable choice for routine fuel system maintenance, helping to keep engines running smoothly and efficiently when used as recommended.