sump oil

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English

Noun

sump oil (uncountable)

  1. Lubricating oil contained in the sump of an engine; the waste oil drained from the sump at the time of an oil change.
    • 1960 December, “New G.E. Line diesel loco maintenance depot at Stratford”, in Trains Illustrated, page 767:
      Dirty sump oil is pumped out along a waste oil pipe line to storage tanks by the boiler house, to be used as boiler fuel.

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