Lucas Oil 10012 Extreme Cold Weather Fuel Treatment, 1 Quart, (Case of 12) Contains special clean burning additives to facilitate a complete combustion burn for more power, better fuel economy and lower emissions Prevents fuel thickening Prevents diesel fuel gelling, the #1 cause of winter breakdowns Specifically formulated for all diesel trucks and off road equipment with non fuel recirculating engines One half gallon treats 250 gallons of fuel