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How does oil recycling work?

Oil Recycling Makes Economic Sense

Recycling oil is cheaper than refining oil from crude. It takes 42 gallons of crude oil but only 1 gallon of used motor oil to produce the same 2.5 quarts of lubricating oil. Recycling oil also reduces our independence on foreign oil; the more oil we recycle, the less oil we need to purchase from other sources.