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fuel cleaner

  1. how often should I run fuel system cleaner? what kind do you recommend?

    Engine Oil, Lubricants & Fluids
    So I have a 2003 Saab 9-3 2.0t with 123,350 which I bought 7,000 miles ago(8 months ago). I have good gas mileage (26.4mpg) but I want to make sure she continues to runs well. I have no clue when fuel cleaner was added when should I use fuel cleaner?
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