oil firing

oil firing (uncountable)

1. The burning of oil in a furnace to provide heat, or in a firebox to generate steam in a boiler.
   • 1961 February, Cecil J. Allen, “Salute to the "Clud Hamiltons" & "Directors"”, in Trains Illustrated, page 115:

     Oil-firing was now becoming more expensive than coal and no more "Claud Hamiltons" were so fitted after No 1859; the apparatus was gradually removed from the engines so equipped, [...].

• oil-fired

• “oil firing” in Lexico, Dictionary.com; Oxford University Press.