Business: Use for Gunk

Throwaway oil makes good

Every year Americans throw away enough oil to fill 15 supertankers. The waste, which runs to 1.1 billion gallons, is the glop that is drained from industrial machinery, buses, trucks and the crankcases of cars at every oil change. The gunk is so grimy that it is usually just sold for pennies per gallon to waste oil dealers.

In Europe, many gas station owners sensibly save the used oil and burn it to heat their workrooms. Now a growing number of U.S. gas stations and auto salvagers are doing the same....

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