Pour point depressants are important class of petroleum additives, used for improving flow properties of lubricating oils, crude oils etc. Present work deals with preparation and characterization of new and conventional alkylate pour point depressant additives, and to study there chemical structure performance relationship. These additives are prepared by friedal crafts alkylation between alpha-pinene, beta-pinene, delta cube careen and Naphthalene with chlorinated paraffin wax. This dissertation covers phenomenon of pour point depression, methods of determination, classes of reported pour point depressants and their reaction mechanism. Literature on the major preparatory reaction, i.e. Alkylation of aromatic and aliphatic hydrocarbons along with alkylation and other reactions of pinenes has been reviewed. Chlorinated paraffins are prepared by liquid phase chlorination of n-paraffins ranging from C₁₄, to C₄₄ These chlorinated paraffins   are made to react with excess of napahathelene, alpha-pinene, beta–pinene, delta cube carene in presence of 3-5% by (wt.) anhydrous A1C1₃ at 70-80°C, of agitation (640-700rpm) and catalyst particle size (550microns). As uniformly maintained throughout the experiments. Pinenes undergo reactions like isomerization, polymerization etc. readily. Alkylation of pinenes with chlorinated paraffin (CPW) is a complex reaction accompanied with side product, To assess, the types of compounds possibly   formed in   the   alkylation   of pinene with CFW, and to determine appropriate reaction conditions, radical catalysed halornethylati on and dlkylation of pinenes with smaller molecules like tert-butyl chloride and methyl acrylate are conducted. Prepared alkylate   additives are evaluated for physical properties and pour point depression test 150N, 500N, TOBS. BHC oils. Quantitative characteri­zation of additives is done by designating a new Constant. Influence of structure of additive on joint depression is studied by varying length of alkyl chain, number of side linkages, Nature of side links. Effect of nature of oil, media on pour point depression is also studied. An attempt has been done to separate, and quantitatively estimate active components, in the additive.