Blue smoke at startup is often an indication of valve stem seals. The blue puff :gray: (sorry, wrong colour) someone else saw is also consistent - If you were running with your foot off the throttle, the resulting vacuum can suck more oil down the stems, which gets burned off as you put your foot down. As Exbury says, you can get it after idling for a time. If you can find a decent hill however, try descending in a low(ish) gear at 3-4000 RPM with your foot off the throttle then welly it. If you see blue smoke, it's probably valve stem seals and probably not piston rings.
Good luck.


