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Blue smoke

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Hey all,  new to the site so not sure where to put all that is done to the truck.  Real fast, the motor was rebuilt 36k ago new everything internal and head (minus crank & rods)  new vp same time, s300 a little after motor new fass150 new 100hp injectors from same shop that built motor, everything done by same shop , 6 money ago started getting blue smoke and "alot" from exhaust pulled turbo had rebuilt, guy said labyrinth seal was coated so rebuilt!  3 days later smoke again.  Took back to shop wyd time saI'd cartridge was worn? Replaced!  A week later still smoking.. weird thing it only puffs small amount when starting then has to get warm to do it again and only when on compression letting motor slow truck down (6speed)..  it don't smoke when accelerating or idle just when slowing down letting off pedal?? Please I need help 

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