Oil isn’t just one thing, or even one type of thing. It’s a mixture of molecules called hydrocarbons (made of carbon and hydrogen) which can be refined into fractions based on their size (gasoline, kerosene, lubricating oils, bitumen and so on).
Oils found in different places are made of different mixtures of these fractions so if you need oil to be turned primarily into gasoline, oil from one source might not be as suitable as oil from another.
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