Fuel Additive - Heavy Duty - Cleaner / Lubricant / Protectant - 1 gal Jug - Gas / Oil - EachzMAX Heavy Duty Fuel Additive is a 1 gallon jug designed for heavy duty engines, including trucks and marine vessels. It acts as a micro lubricant, soaking into metal surfaces to reduce carbon build up, improve lubricity, and enhance engine performance. This product helps to extend the life of your vehicle by reducing friction and wear, improving fuel efficiency, and protecting vital engine components. It is trusted by professionals and is available