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flex fuel

  1. Mr.G

    E85 Flex Fuel Do you run it yes or no

    I just want to see how many of us 2007 newer 5.3L Flex owners Still run the E85 Flex fuel or not, and hears why. Last year when I had my 07 at the Dealer for repairs, they told me not to run Flex fuel because it was bad for the engine even though the engine was designed and built to run E85...