On 2 different times now I have had the cooling fan kick on while sittin idling for like 10 minutes and then I get a very faint oil smell in the car. I was lookin tonight and found oil leaking at the turbo oil line and have already ordered the Detroit tuning replacement lines. I also found what looks like oil mist or residue all over the back of the residue. It's not extreme but its there on an otherwise spotless valve cover. Anyone know where this is coming from? Is this common?