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:
“All the heavy days are over;
Leave the body’s coloured pride
Underneath the grass and clover,
With the feet laid side by side.”
—William Butler Yeats (1865–1939)
“Can he who has discovered only some of the values of whalebone and whale oil be said to have discovered the true use of the whale?”
—Henry David Thoreau (1817–1862)