Residue from crude oil after distilling off all but the heaviest components, with a boiling range greater than 1000 degrees Fahrenheit. Road Oil. Any heavy petroleum oil, including residual asphaltic oil used as a dust palliative and surface treatment on roads and highways. It is generally produced in six grades from 0, the most liquid, to 5, the most viscous.
FREE WEEKLY NEWSLETTER
Learn more practical information like this in the OPIS Weekly Energy Update. It’s a FREE newsletter full of exclusive content, insight and education on the global energy market.