Exhaust Soot - GMC Terrain Forum : GMC Terrain Forums
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Old 05-17-2015, 01:53 PM   #1
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Default Exhaust Soot

My 2010 with 54k miles on it has had black soot in the exhaust tips from day one. Any ideas as to how this can be eliminated?
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Old 07-08-2016, 01:40 PM   #2
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I have a 2015 V6 and it does the same thing..not bad, but enough to notice after a couple of days..

I've tried 91 octane to 87 octane fuels, E10 ethanol to pure gas..no difference..I find Shell gas leave less soot at 89 Octane....Must be a catalytic converter thing.
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