Light sweet crude oil is one of the most sort after types of petrolium. It is used for the production of gasoline, kerosene and diesel.
It is called sweet because of its low levels of sulphur, less than 0.42%. Higher levels of sulphur are designated sour, and it literally means the oil is sweet to taste, well sweeter than its sour heavy cousin. Early oil prospectors would check the quality of the oil by tasting it; needless to say the oil was not ingested.