so i'm parting out a vanagon and i want to save the hydraulic components
and i don't want them to be rusty on the inside when i decide to use them.
so i was thinking of draining the system and flushing it with some kind of
oil/fluid that is not hydrophilic.  i was thinking hydraulic jack oil or
some other type of thin generic oil.

i mentioned this to reputable local shop and the guy there suggested that
some petroleum based oils might cause seal swelling.  he suggested using
mineral based oil like the pentosin used in the audi power steering
systems.  we also discussed using silicone brake fluid since it supposedly
doesn't absorb water and silicone paste is what you use when you build
hydraulic brake components and put them on the shelf.

any suggestions and comments on the issue would be great to hear.

jonathan