I haven’t run across any oil in the vacuum system. The vac pump tested ok as far as the vacuum levels are concerned, so I figure the seals are ok. It’s really that all of the rubber in the parts has dried out. The connectors are loose and valves are leaky. Its looking like everything will need to be replaced.
I’m a little more encouraged after checking prices with the site's new sponsor. Their parts are less than half of what I have been paying.
Thank god I was born without guilt or I would have a problem with making a big order after it’s all finished and taking the parts to the MB dealer for a refund.