Opti-Lube XL Xtreme Lubricant Diesel Fuel Additive: 1 Gallon with Accessories (1 Hand Pump & 2 Empty 4oz Bottles) Treats up to 1,280 Gallons Exceptional Lubrication for Reduced Fuel System Wear Improved Fuel Economy Reduced Deposits and Emissions Prevents Rust and Corrosion Cleans Injectors