Heh, the problem is, I can't find any article on what vacuum levels to look for. The booster holds 20hg for hours upon end with little to no loss, so I ruled that out. The interior dashpots (when they get vacuum) seem to work just fine, and even if they didn't, I couldn't see them draining enough vacuum to knock out the whole system. Locking system is tight, as well.

That just leaves "stuff under the hood". Where should I test first, and what should / shouldn't hold vacuum?

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(Oo{=|=}oO) 1983 MB 300D USA, 212,000mi. 80's yellow/white. "Gunther"
(Oo{=|=}oO) 1984 MB 300D Euro, Turbo Added in Germany, 186,000mi [SOLD] Missing her dearly.
(Oo{=|=}oO) 1984 MB 300D USA Turbodiesel, 269,000mi. [SOLD]