Heavy oil may refer to:
- Fuel oil that contains residual oil left over from distillation.
- Heavy crude oil, viscous crude oil.
- Coal tar creosote, a wood preservative and waterproofing agent.
Famous quotes containing the words heavy and/or oil:
“The great end of life is not knowledge, but action. What men need is as much knowledge as they can assimilate and organize into a basis for action; give them more and it may become injurious. One knows people who are as heavy and stupid from undigested learning as other are from over-fulness of meat and drink.”
—Thomas Henry Huxley (1825–95)
“I bade, because the wick and oil are spent
And frozen are the channels of the blood....”
—William Butler Yeats (1865–1939)