Originally Posted By: tfabris
But I've had a car which produced that exact symptom: Puff of steam (which looks like light blue smoke) when starting in the morning.


Blue smoke at first startup in my experience is most likely a leaky valve seal. The oil drains in from the valve when it sits and then puffs a bit of blue when started.

My tractor has been doing that for years. It's just extra lubrication on startup as far as I'm concerned