1865     1/2  				When these two products shall have been separated, the hot residual oil may then be transferred from the still A to another still.
1949     		(Anglo-Iranian Oil Co.)	 		(ed. 2)	 xiii. 291  				Diesel oils are frequently dark coloured due to their content of residual oil.
2005    J. G. Speight  iii. 72  				Residual oil has been used successfully to power marine diesel engines.