10 Best Auto Fuel Additives 2025 in the United States

The Lucas Oil 10003 Fuel Treatment is a versatile additive, suitable for both gasoline and diesel engines. It's designed to improve fuel economy, enhance power and acceleration, and clean the fuel system, including injectors and combustion chambers. The additive also helps neutralize sulfur and other contaminants, which can extend the life of your engine and its components.

It's particularly beneficial for those looking to maintain or improve the health of older engines, as it safely replaces the need for lead without causing harm. Additionally, it prevents rust and corrosion, aligning with federal low sulfur content requirements for diesel vehicles and equipment.

A standout feature is its ability to increase MPG and reduce exhaust emissions, making it a practical choice for regular engine maintenance. Lucas Oil is a reputable brand in the automotive industry, adding a level of trustworthiness to this product.

The Chevron Techron Concentrate Plus Fuel System Cleaner is a highly concentrated auto-fuel-additive that is designed specifically for gasoline engines. It comes in a 20 oz bottle, which is suitable for treating larger fuel tanks or providing multiple treatments for smaller tanks. This product is well-regarded, holding the #1 spot in fuel system cleaners and boasting a 4.6-star rating from over 15,000 customer reviews, showing strong brand reputation and user satisfaction. It targets common engine issues such as rough idling, engine surging, hesitation, and spark plug fouling, making it effective for maintaining smoother engine performance and improving cold start performance and fuel stability for up to a year.

This could be particularly beneficial for those experiencing these specific issues or looking to prevent them. The additive is easy to use as it is in liquid form and unscented, which makes handling it more pleasant. However, it is essential to follow the recommended dosage instructions to avoid overuse, which can be a common concern with concentrated formulas. Moreover, as it is specifically formulated for gasoline engines, it is not compatible with diesel engines, limiting its use in mixed-vehicle households. Despite this limitation, the Chevron Techron Concentrate Plus remains a strong contender for anyone seeking to improve their gasoline engine's performance and longevity.