We look after a few of these vans which are essentially fiat forino's.

They all smoke ( blue/white ) when cold, and randomly when hot, its not a small amount but its enough to turn heads and make other drivers back off.
when they first start from cold they're clean ( not valve seals) until they start to get warm.

They're all around 25k miles.

We have carried out a full induction clean inc removing the intercooler and cleaning that, next day just the same.
one of them we replaced the turbo, no change.
vented the pcv to atmosphire , no change

any thoughts would be welcome as I am out of ideas.

Thank you