I posted this question under the Tech forum, but perhaps someone more familiar with diesel fuel can help.
My wife took my car to work today. She stopped to put gas in it. She says that she put in about a dollars worth of deisel before she realized it. In a panic, she put in only $4 dollars worth of gas and drove home.
What should I do?

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1993 190e 2.3
Spruce Green Metallic
62k original