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Q: I own a 1994 Mercedes E320. The check-engine light came on, so to the shop I went. They said the problem was carbon buildup and the cost to remove the carbon is $2,500. Is there any cleaner that I could put in the gas tank to remove the carbon?
A: There are no mechanics in a can or bottle that can remove the carbon you describe. Any cleaners put in the gas tank have to be weak enough not to take the protective finish off the tank, not damage the fuel pump or clog the fuel filter. There are professional cleaners that do work, and the chemicals are introduced directly into the engine by way of the fuel rail, being careful not to let any of the cleaning chemical into the fuel tank. The use of premium gas can help clean the back side of the intake valves. If the engine is running well and the car does not have to go through an emission test for state inspection, I would not spend any money on the repair.
