The use of oil in the world has undergone a spectacular change during the twentieth century. this became popular on the convenience, versatility, low cost availability in oil in different regions or places of the world. Due to the relatively low transportation cost as compared to other fossil fuels such as coal and gas, it became popular in industrial and commercial sectors. The development of automobile industry gave tremendous impetus to "Oil consumption" in the developed countries. Today crude oil is the most important energy source in the world.