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Sort of on topic: One time I drove about 120 miles round trip in extreme cold. I had IAT showing on the Scangauge and it went as low as -6* F. The next day I noticed a small patch of white stuff on the bumper directly above my tailpipe. I couldn't identify what it was or why it was there, and thought it might be some sort of combustion byproduct. But I can't imagine what, or what the cold had to do with it.
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