My 2011 Chevrolet Duramax ran very poorly. Poor mileage and constant check engine lights year round. Went to dealer for engine diagnostics. Cost me $200. To tell me the turbo vanes are stuck they had to be replaced at $2749. I read about this product and had my doubts. I figured I'd rather taste a bottle before spending it. Let me tell you I poured about 12 gallons of fuel and went to the hard drive. It works like NEW and after 3,000 km the check engine light does not come on. love it
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