Prevents diesel fuel and #2 home heating oil from gelling and safely removes water from diesel fuel. Contains no alcohol or other harmful solvents. Increases power and fuel economy. Reduces cold filter plugging point. Cleans and lubricates fuel injectors and eliminates smoking and rough idle. Safe and effective in all diesel, including ULSD (Ultra Low Sulfur Diesel) and biodiesel blends to B-20. Particulate filter friendly and warranty safe. Pours and handles down to -20 degrees Fahrenheit.