Waxes from the Bombay-High crude oil have been separated by solvent dewaxing, in the form of deposition in the Esso Assembly and from the centrifugation on a Beckman Centrifuge as sediments and decanted oil, in order to study their structural changes using a Rigaku x-ray diffractometer. Characteristic x-ray diffraction patterns are observed for the oil agglomerates and crystallites and their relative concentration in a wax sample estimated. The x-ray diffraction patterns of waxes with a pour point depressant additive remarkably differed from those without additive, leading to the measurement of the effectiveness of the additive. The additive action is seen in the conversion of three dimensional lattice of highly interacting wax crystals into agglomerates of low interaction.