and i dont mean benson & hedges!!!

when driving if i shut off then re-apply throttle then hey presto a big puff off blue smoke...its deffo oil cause you can smell it
same when i pull off from junctions
give it full welly and the after the initial"puff" it clears...but then shut off,then back on .and puff!!

i have changed the turbo (for one i know is good) still the same

i took the car on the rollers the other day and whilst there i had a leak down test on the cylinders..that was fine each cylinder was less than 10%

any ideas???