"It cost me less per bottle than the present-day cost of a tank of gas, and my engine in my 2002 Chrysler Sebring is worth $6,000," said John Marchant of Jacksonville's Northside. "The dealership told me I had sludge in the engine and they couldn't do anything for me. I put Auto-RX in my oil. My engine is now quieter and running smoother. It's working."