Opti-Lube Boost! Formula Diesel Fuel Additive: Quart Treats up to 640 Gallons Boosts Cetane by 7-9 Points, Which Improves Fuel Economy and Increases Power! Enhanced Lubricity For Reduced Fuel System Wear Reduces Deposits & Emissions, Keeping Injectors Clean Prevents Rust & Corrosion. Improved Water Separation Improved Storage Stability (more than doubles the life of diesel fuel)