In actual fact, the amount of oil actually leaked was quite small, as just a small bit looks to the casual observer, quite a lot more.
The airflow spreads a small amount out quite a lot so it looks much greater.
By far, the greatest, was oil consumption.
The CurtisWright turbocompound engine, for example, used on the DC-7 consumed (burned) at least one half US gallon, per hour, per engine.
The limit (generally) was two US gallons/hour/engine.
And yes, gallons is correct...not pints, quarts or liters.