The price of a barrel of oil increases as it passes through the refining process. According to the US Department of Energy for each dollar you spend at the pump: Taxes: 15 cents Distribution and...
Oil refining is a process to separate crude oil into its different components, or fractions. The process starts with crude oil being turned into a vapor and sent into a tower called a fractionation...
Actually raw oil contains substances like more cholesterol and unsaturated fat and even certain % of wax, so unless its refined it's not good for health, refined oil is good for health.
After Refining Crude Oil, These things can be made: (Going down according to density)
Bitumin (Tar or Asphalt)
Fuel Oil (Ship Fuel)
Heavy Lubricants or Wax
Light Lubricating...