Alright, thanks for the further insight everyone! I should be getting all parts later this week, and get to it on friday. There seems to be so many causes for error. I'll just replace all seals and hoses and see what happens. Hopefully I don't run into too much trouble.

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1985 W460 300GD OM617.912 w/ STT turbo (ongoing OM606 engine swap)
2011 W212 E220 CDI