Although variously defined, the upper limit for heavy oil is 22° API gravity with a viscosity of 100 cp (centipoise). The American Petroleum Institute's "API gravity" is a standard to express the ...

Oil prices decline for a third week due to U.S. sanctions on Iran and trade war fears with China, impacting demand.

classifies crude oil according to the 'API gravity' method it established. API gravity is a value that compares the relative density of crude oil to water at 60°F (15.6°C) and is calculated using a ...