Crude oil is a hydrocarbon with the chemical compounds of other small, such as sulfur compounds, nitrogen, and oxygen. In order to convey. These are used, they must be separated from the first.(Refining) crude oil is different in each of the world. Or even the same hole depth of different oil still containing hydrocarbon compounds and other compounds are different.(thick, so that it is difficult to pump it up from the ground itself)
.Crude oil with low sulfur additives is considered as it is expensive, crude oil is used directly. To be distilled at the refinery. Acting fuel types. It fills, cars, diesel car, boat, train,These oils are treasure different and price is not the same.
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