Aromatic extract residues, as by-products, are accumulated in local refineries through the refining of lubricating oils. These residues are dealt with as low economic value products, even their disposal imposes serious problems to the refineries. Therefore, the present work is aimed at upgrading these residues by using them to synthesise some different petroleum additives, e.g. antioxidants, ashless dispersant additives, pour point depressants and flow improvers for crankcase lubricating oils and fuels. Antioxidants are synthesised by reacting mono-aromatics with phosphorus pentasulphide (P2S5) in the presence of zince oxide (ZnO). Ashless dispersant additives are synthesised by reacting alkylated mono-aromatics (using chlorinated paraffin wax as alkylating agent) with formaldehyde solution (37%) in the presence of polyisobutylene succinimide. Pour point depressants and flow improvers are synthesised by acylating di-aromatics via a Friedel-Crafts’ reaction. Comparative evaluation of the performance of the synthesised products with commercial additives showed their good efficiency.