Enhance the performance of your diesel engine with Stanadyne Performance Formula Diesel Fuel Additive. This pack of 1 gallon is a direct replacement for your vehicle's fuel system, suitable for diesel engines. The additive is manufactured in the United States by BD Diesel and is OEM approved by Ford, Dodge, VW, GM, and more. The product contains and can expose you to various chemicals such as Naphthalene, Ethyl benzene, Toluene, Cumene, Propylene oxide, Benzene, Ethylene oxide, and Methanol for which the State of California has found to cause cancer, birth defects, or other reproductive harm. This item is a perfect fit for those who want to improve their diesel engine's performance without compromising on quality.