Cetane-amplifying additive for diesel fuel. Effectively improves the cetane number of fuel, reduces consumption and decreases the smokiness of exhaust gases. Especially demanded for winter and arctic grades of diesel fuel, as well as diesel fuel from gas condensate or with high paraffin content. Dosage is 130-800 g/t. 250 g/t additive increases the cetane number by 5 units on diesel fuel from Surgut Condensate Stabilisation Plant.