Steam oil contains something besides just petroleum oils because the oil  
will be washed off cylinder walls, pistons etc by steam and hot condensate. The 
 
additives are usually referred to as "tallow" although I doubt is actual 
tallow  is now used. But, some kind of not petroleum product that will stay in  
place.  Different steam oils are made for saturated and for  superheated steam. 
 
When I worked in power plants one of our  consultants was a "lubrication 
engineer" and when I asked him about steam oil  for low pressure reciprocating 
engines he gave me a five gallon can that I  am still using.  I am pretty 
stingy 
with the steam oil and use  ordinary machine oil on wheels, rods etc and save 
the "good stuff" for the  cylinder lubricator only. 
 
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