Quote:
Originally Posted by JoeM3SSII
I guess carbon buildup in the engine internals could be unrelated to carbon buildup at the tail pipes ? I get quite a bit of the latter, i guess it's where all that oil consumption goes that bmw wants to insist is normal and isn't.
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Soot is a byproduct of combustion, any car's exhaust will have some carbon particulates in it. If it's overly-sooty, that's a sign you're burning oil and/or running rich.