SR cylinder oil
SR cylinder oil[¦es¦är ′sil·ən·dər ‚ȯil]
A viscous, unfiltered lubrication oil, generally made from reduced petroleum crudes that have had the lighter lubricant fractions removed by direct steam heating; used to lubricate steam engine cylinders and valves. Also known as steam-refined cylinder oil.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.