An oil of high specific gravity specifically: a high-boiling distillate from tar. Heavy crude oil is highly-viscous oil that cannot easily flow to production wells under normal reservoir conditions. It is referred to as “heavy” because its density or specific gravity is higher than that of light crude oil. Heavy crude oil has been defined as any liquid petroleum with an API gravity less than 20°.
Royal Petroleum offer Heavy Crude oil produced by all over the world.