Out of numerous additive types the detergent-dispersant (DD) additives have the most important role. Their function is to clean and keep clean engine, thus the removal of deposits and the prevention of their formation. High DD efficiency of succinic-type additives is commonly known. The aim of our research work was the modification of the additive structure by the incorporation of a fatty acid methyl ester molecule into the succinic-type additive and a styrene co-monomer. Beside the objective to keep the advantageous properties of the conventional succinic-type additive structure, further advantageous effects were expected to be assured by the new structure of the additive. Detergent-dispersant, additional antiwear and viscosity improving effects of the novel additive were verified by analytical and laboratory performance tests. Infrared spectroscopy (IR) and magnetic nuclear resonance (NMR) tests were carried out to determine how the fatty acid methyl ester compound connects to form the novel structure of the additive.