2003 BMW 530

Engine Performance problem
2003 BMW 530 6 cyl Two Wheel Drive Automatic 130000 miles

hi, my car blow clouds of white/blue smoke on cold start when I rev the car but after a few revs it stops. I have also noticed a delay on the turbo kicking in and seems slow. I have taken it to bmw garage and all the diagnostics seem fine. Another garage believed I had a leaking injector. I have replaced all the injectors but still does the same. Please help.
November 1, 2009.

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