Power Service Diesel Fuel Supplement + Cetane Boost - 12/32oz. Bottles Prevents fuel gelling in temperatures as low as - 40F Equals performance of a 50/50 blend of No. 2 and No. 1 diesel fuels. Lowers Cold-Filter Plugging Point (CFPP) as much as 36F. Keeps fuel-filters from plugging. Boosts cetane up to 4 numbers for faster cold starts For all diesel fuels, Ultra Low Sulfur Diesel (ULSD) and blends containing up to 20% biodiesel (B20).