The Upper Darby Township Police Department in Delaware County, Pennsylvania, is looking into a series of recent thefts involving used cooking oil.

In one incident, men in a white truck stole waste vegetable oil from behind Wilson's Secret Sauce barbecue restaurant.

The restaurant industry refers to it as "yellow grease," which is the used oil from deep fryers.

Steve Wilson, the owner of Wilson's Secret Sauce, said the thieves broke the container's lock and got to work.

"What they do is go around to all the different restaurants," Wilson said. "So they're taking $100 from here, from there."

Wilson said this has happened to him before. He said he makes 29 cents a gallon for his waste oil.

Police said they're looking into the theft, which has happened at a number of other places.

If th

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