Opti-Lube Summer+ Formula Diesel Fuel Additive: 8oz 6 Pack Treats up to 160 Gallons per 8oz bottle Boosts Cetane and Enhanced Lubricity for Reduced Fuel System Wear. Improved Fuel Economy, Increased Power Cleans Injectors, reduceses Deposits and Emissions. Prevents Rust & Corrosion Improved Water Separation Improved Storage Stability (More than doubles storage life of diesel fuel)