Dura Lube Severe Fuel System Cleaner is highly concentrated and precisely formulated to clean the entire fuel delivery system including Fuel Injectors, Carburetors, Valves, Ports and Intake Manifolds. 100% Safe for all vehicles including GM & GMC, will not void warranties Helps remove valve stem gum. A cleaner running engine helps improve fuel mileage Compatible with all grades of gasoline fuel including E-10, E-15, and E-85 Ethanol blends Not for use in diesel engines Will not harm catalytic converters Restores Injector Flow Adds Corrosion Protection Stabilizes Poor Quality GasolineDirections: One 16 fl. oz. bottle treats up to 42 gallons of fuel. Use at least every 3000 miles.Dura Lube Severe Fuel System Cleaner is an advanced solution designed to clean and restore your vehicle's entire fuel system for optimal performance. Over time, harmful carbon deposits can accumulate in fuel injectors, intake valves, and combustion chambers, reducing engine efficiency, causing rough idling, and increasing fuel consumption. Dura Lube's powerful formula penetrates and breaks down these deposits, ensuring a cleaner and more efficient fuel system.This fuel system cleaner not only restores lost power but also improves fuel combustion, leading to better throttle response and increased fuel efficiency. By eliminating carbon buildup, it helps reduce engine hesitation, knocking, and misfires, providing a smoother and quieter ride. It's ideal for high-mileage vehicles or engines that have started to show signs of wear.Dura Lube Severe Fuel System Cleaner also provides ongoing protection, preventing future carbon buildup and ensuring long-lasting cleanliness. It's compatible with all gasoline engines, including those using ethanol-blended fuels, making it a versatile and essential tool for maintaining your vehicle's fuel system. Use Dura Lube during regular maintenance or when you notice a drop in performance for immediate and effective results.