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  1. Octane Booster in place of Premium Fuel?

    Fuel Economy and Alternative Fuels
    Hello, I have an 09 Forester XT. I have determined that I at least want to put 91 octane in my forester, but I am looking to save some money. Has anyone tried octane booster with mid-grade or regular fuel for their Subaru Turbo? Theoretically can I mix half and half of 89 (mid-grade) and...
  2. ('03-'05) 2004 - Running Rich on one side, "Unknown" Codes (video)

    Problems, Maintenance, and Warranty
    I bought a '04 Forester XT 4AT a couple months that wouldn't really idle. There was no check engine codes, if I remember right, at the time I got it. I proceeded to change plugs and do simple troubleshooting, and nothing fixed it. Naturally, I decided to pull the engine. All the exhaust valves...