Why is crude oil called a mixture?

Answer 1

Mixture of naturally occurring hydrocarbons that is refined into diesel, gasoline, heating oil, jet fuel, kerosene, and literally thousands of other products called petrochemicals. Crude oils are named according to theircontents and origins, and classifiedaccording to their per unit weight(specific gravity). Heavier crudesyield more heat upon burning, but have lower API gravity and market price in comparison to light (or sweet) crudes. See also petroleum

Answer 2

Crude Oil is typically a heterogeneous mixture.