Lucas Anti-Gel Cold Weather Diesel Fuel Treatment is designed with real water dispersants and the highest quality components to prevent fuel thickening and gelling in diesel, ultra low sulfur diesel and bio-diesel fuels. When diesel fuel gels it often contaminates and plugs the fuel filters, causing a no start condition. To prevent costly repairs simply add Lucas Anti-Gel Cold Weather Diesel Fuel Treatment with each tank of fuel to add protection up to -10°F or add a second bottle for protection up to -40°F. The convenient container sizes eliminate the need to figure out mix ratios and over treating is not harmful to the engine, a one quart bottle treats up to 150 gallons and a one half gallon bottle treats up to 300 gallons of fuel.