This image taken from Raw to Ready: Komatsu, demonstrates the process of separating mineral oil from raw crude called fractional distillation. Each element of crude oil evaporates at a different boiling point. By heating crude oil to 650 degrees Fahrenheit, workers isolate the mineral oil by turning it into vapor. When the vapor cools, it condenses back into a liquid state for collection. Once separated, the mineral oil’s thickness can be tested and adjusted.