Just some info on turbos. Unless you are going to pump the return oil from the turbo there must be 0 and that means '0' back pressure on the return line other wise you will get serious leakage past the bearings and likely bearing/seal failure.

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Mark
82 300SD 110k
91 Caprice SS
92 Jetta TD
97 Cadillac Concours(300hp)
84 Celebrity 4.3L diesel