As the tag line says, I'm getting delayed gray smoke out of the tailpipe after I sit at idle for a minute, then when I take off I get a puff and it clears. I know that I am about a 1/2 quart overfilled from changing the oil the other day. I'm away from home, but will drain that out tomorrow. Other thoughts are a leaking seal on my HTT 62/12, valve guides, or worse. #@$%! Truck runs well but is taking a little longer than usual to cool down. Again pointing to the turbo. Anyone have these symptoms before?