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A composite additive that decreases the cloud and solid points of GShZ gas-condensate diesel fuel, stable condensate "heavy" bottoms, to the values required by GOST 305-82 for grade "3-45" petroleum diesel fuel, was developed from domestic feedstock. This significantly improves the performance properties of gas-condensate diesel fuel..With stiffening of the requirements for the quality of diesel fuels (DT), additives with different functional applications are being increasingly widely used [1][2][3]. The quality of the GShZ DF processed at Urengoigazprom LLC totally corresponds to TU 51-28-86 and to the requirements of GOST 305-82 for winter Z -45 DF of petroleum origin on all indexes except for the cetane number (CN) and kinematic viscosity.