Turbo's DO NOT have oil 'seals', they have an oil control ring that is that similar to a compression ring on a piston, they are called a seal because well they seal the chamber and do not let oil out, the seal does not get brittle and hard, it will get covered in carbon and fail the same way a compression ring does.
If the turbo has not been used in a while then you can do one of the following:
1, put oil in the turbo be either filling the inlet or drain.
2, Undo the turbo drain, pull the plugs out (including the coil driver/ignitor) and wind the engine over until there is oil present in the drain.