Should have checked with you guys sooner but just thought of this after looking at another thread. I know the whole coolant, LIM/UIM, has been discussed over and over, but when I got my 30,000 mile service done they flushed the coolant and said it was black. Mind you I am not losing any coolant at all and dont smell it. Checked exhaust and is not sweet or anything. Are my intake manifolds leaking already? I know the Dex turns brown a lot and all but never heard anything about it turning black??!! Help is appreciated.