The problem is one of two possibilities:

1) Worn turbo seals allowing far too much oil to reach the intake.

2) Worn rings allowing too much blowby and too much oil ends up in the intake.

The only way to confirm which of the two is the issue is to pull the breather hose and run it into a bucket. Drive it for a few hundred miles and check the bucket. Either the oil is there.........or it isn't.