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Bookmark or Share- Gumout Multi-System Tune-UP vs SeaFoam - Engines - RedSquare Wheel ...The ONAN Performer series engines seem to carbon up relatively easily.A periodic de-carbon procedure is recommended.The procedure is at least a PIA. Has anyone tried the Gumout Multi-System Tune-Up?I picked some up at Walmart ($6.47) and it is about the same price as SeaFoam ($6.74 at Walmart and...
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