Hi all

What's a common cause of, blue smoke at idle, only when hot. Doesn't do it on initial cold start, or at all until the engine is up to temp.

Puff of blue smoke as I come onto full boost and then it seems to disappear, although it could still be there any i just cant see it once I'm moving at speed...

Spark plugs look normal and don't appear to have any oil contamination. 

Here's a video:  https://www.youtube.com/watch?v=MB9eNMEpP1I