Steam oil is high temperature lubricating oil for pistons and valves on steam engines of ALL sizes including the real thing. Viscosities vary even for the gauge one models, but all varieties can withstand the temperature of the steam in the valve and piston cylinders. Displacement type lubricators found in the smaller steam locos usually need frequent draining due to the steam condensing into water after displacing the oil to the cylinders. This is one of the sound reasons for frequent service stops.
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