hey guys, i need your opinion on this: fact 1, my turbo is burning oil(blue smoke come out from exhaust, and oil appears at compressor inlet and turbine outlet), what i thought was some kind of sealing inside the turbocharger was worn out. but after reading the article below:

Engine oil under pressure enters the bearing housing from the oil inlet line. This oil passes between the bearing and journal surfaces where, as a result of turbulence, air is mixed with the oil. The oil leaves the bearings looking somewhat like a "brown whipped cream", then falls by gravity to the sump at the bottom of the bearing housing. This foamy oil then flows by gravity down the oil drain line and into the engine sump. Anything which prevents this gravity draining will cause the foamy oil to build up in the bearing housing to a height above the oil seals. Under this condition, the oil will leak out into the compressor and turbine housing past the piston ring seals through he piston ring gap.

what i need to know is, how high the pressure could blown the sealing? because my oil inlet is not connected directly on oil sending unit behind engin block. i have a oil cooler before i put on the turbo, when i installed the turbo, i made a " T " fitting inline with the oil cooler. what i mean is: oil come out from engin, then go through oil cooler, then majority oil go back to engin, a small portion used to cool down the turbo. will this set up consider to be unsafe to turbo,(high pressure??? )

this was a used turbo, and i don't know if it was damaged or not when i got it. do u think my set up damaged the turbo???
any opinion will be appreciated.