I recently discovered that despite the fact that the engine shuts down fine the shut off diaphragm was leaking oil. It has made me think we should put a clear filter in our brown shut off vacuum lines so that oil leaks into the vacuum system are visible. I had assumed that a diaphragm with a hole in it would manifest with poor/no shutdown so oil leaks would be readily detected. Apparently not so.
I haven't found an appropriate filter to go in the line but I will look for one when I next visit an auto parts store.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13