vauhall vivaro 1.9 di 05 plate - help - raol

hi,my van broke down the aa recovered van told me turbo was blown.i have taken van to my local garage he's replaced turbo twice it's still starts chucks oil out through exhuast itercooler ect and cuts out he's pulling his hair out and so am i,it's been there a week and i can't work.he's going to take head off tomorrow to see if it has a bent conrod.the van has only done 78000 miles.any ideas welcome please