NEW! STP® Diesel Fuel Treatment with Greenclean® Detergent Technology is a complete solution to improve the quality of your diesel fuel as it lubricates critical fuel system components, cleans fuel injectors, and boosts cetane. STP Diesel Fuel Treatment uses the only additive technology that cleans injector deposits and continues to protect against the formation of new deposits which decreases power, lowers fuel economy, and decreases rust and corrosion of critical fuel system components. On initial cleanup of fuel system, use one 64 oz. bottle per 150 gallons. After initial cleanup, use 32 oz. per 150 gallons. This year-round formula increases power more than 3%, provides for smoother and quieter engine operation, and improves fuel economy more than 2%.