That should have said oil line to the turbo was replaced twice.
Car was stood for 4 day and no smoke on start up so for me the problem was replaced.
Some numbers for the others with the same problem, all Dublin prices.
Bmw main dealer:
Oil line replacement is about 1200e ( 100 for the line, rest Labour)
Turbo replacement is about 4.5k (3.5 turbo, rest Labour)
Indy:
Replacement turbo (same turbo as main dealer!) is about 1.5k
Turbo rebuild is about 400e
Labour 1.5k, which is more expensive than main dealer rate but best I could do. And kinda understandable as the car was taking up a lift while the turbo was being rebuilt.
I use bm modification works for the labour. Good service, will use again.