Help !... A6 2.7 biturbo

[Knuif]

Hi all...

It is winter (-10 degrees)
I have a problem with my car. When starting engine.. no problems.. After about 2 km driving the car gets very much blue smoke through exhaust pipes.. This is for about 20 km, then the problem is gone.. Refilling oil (about 1,5 liters) then..No more blue smoke and no problems... no more using oil etc....
Next day.. the same problem occurs again. Only when the engine is cold.

It looks like something freezes up during the night.

The garage doesn't know what to do. They checked and cleaned the ventilation system of the engine and replaced a broken oilventiel/valve. Further they build inn an engine warmer system. but the problem didn't go away.

Who knows what to do about this problem.

please help !

thanks,
Knuif