FWIW, the vacuum locks on a W124 aren't related to retaining a reservoir of engine vacuum - there is a separate on demand electronic vacuum pump located under the right rear passenger seat in the wagon. So, if the locks work it would be independent of time left sitting. It sounds like a pretty nice project car - lots of little things to do but nothing too major. It just seems like a few thousand too much for what it is.

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1987 300TD 231,000
#22, afterglow, plastic fan, euro lights, alternator upgrade, cluster housing update