The invention relates to a method of manufacturing a lubricant additive for internal combustion engine fuel, in particular for diesel fuel. This additive comes, in particular directly, from the esterification of acid oils. Such acid oils are in particular derived from the acidification of a neutralization paste obtained by a refining process, preferably a chemical refining process, in particular a saponification process, of one or more oils chosen from vegetable oil and / or animal oil. The lubricant additive according to the invention is more particularly intended for fuels having a low sulfur content, for example less than 500 ppm (weight).
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