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Old 03-23-2011, 07:12 PM   #2 (permalink)
Allch Chcar
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Join Date: Jan 2008
Location: North Coast, California
Posts: 429

Cordelia - '15 Mazda Mazda3 i Sport
90 day: 37.83 mpg (US)
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My only knowledge of seafoam is that it is recommended you change the oil within 500 miles if you do use it in the crankcase. And quite possibly the sparkplugs if you use it in the fuel tank. It's not supposed to stay in the oil, it's to clean out any buildup so changing the oil only seems logical. The sparkplugs could be a concern if it starts missing after you use it in the fuel tank, it could foul the plugs.
-Allch Chcar

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