carlegacy

ok car has started to smoke a little been doing so for a week or so now not a huge amount but enough for you to see in the rear view mirror.its a legacy turbo and only smokes when the car has been idleing for a while,if it has been idling when you rev it up it smokes but pull away and within a couple of hundred yards tops the smoke dissapears.any ideas.
it doesn't smoke when it is idleing just when you raise the revs.and once running it doesnt smoke not even if you give it full boost.