Refrigeration compressor oil, if the oil is clean and unburnt I keep a gallon on hand for oil top up's and oil changes on my air compressor.
Depending on the manufacture, compressor could be either a synthetic or mineral oil, the latter has been the choice for refrigeration compressors and air, makes for a good cutting oil when drilling metal or using the metal lathe.
When I had the waste oil hot water boiler I used any and all types of oil for fuel. The boiler was a PITA, required a supply of compressed air and the filters needed constant cleaning. Many times would come out to a cold shop because the burner had shut down during the night.
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