For Heavy Crude we have terms and definitions in 2 topics. The topics are Energy and Gasoline.

Crude oil of 20 degree API gravity or less; often very thick and viscous.
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Oil with a gravity below 28 degrees API. Recovery generally involves an application of heat and steam. Canadian pipelines generally require oil to have a gravity of at least 21:2 degrees API. Heavier crudes must be blended with condensate or NGLs to be shipped by pipeline.
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