Frost protection and combustion chamber cleaner, suitable for summer and winter diesel fuels, as well as heating oil. Diesel winter additive improves the fluidity of diesel fuel in winter. At the same time existing deposits are reduced to the injection units and prevents their formation. The ignitability of the diesel fuel is increased, the tank and the fuel lines are protected against corrosion. Since condensation is bound, no accumulation in the fuel tank. Diesel winter supplement reduces fuel consumption and reduces the tendency to soot and nick.