Additives are a product of petrochemical synthesis, they are hydrocarbon and organoelement compounds of different types and classes, including low molecular weight surfactants and polymers. Additives have different compositions and properties, as well as areas of application. Their use requires special knowledge and experience. After all, even substances belonging nominally to the same category, say "depressor additives", depending on the composition and manufacturer may have absolutely different mechanism of action and specific technology of introduction into fuel. In this regard, it is important that manufacturers and suppliers of additives inform the consumer about all the features of the substance, provide professional advice to the technologist and a full package of documents. Only in this case it is possible to use the products with confidence and count on their effectiveness. The monograph describes methods of production and research of oligomeric compounds based on available organic and inorganic compounds, as well as with the use of a secondary polymer - polyethylene terephthalate as depressor (DPOR) and flame retardant (flame retardant) additives of target purpose.