Joe,
It sounds like valve stem seals to me
When a car sits over night oil from the head can leak past worn stem seals and drip into the valve \cylinder this will cause smoke on start up from 5-15 seconds depending how severe it is.
It could also be rings or the turbo but I doubt it..... If its turbo seals it would not stop smoking
I'm a correct to assume that this is blue smoke and not white \ i.e.: hg
Dan