Well, take two... seems the gears that control the rollover (09 ->10, 99->100, etc) are loose, and tend to shift out of position thus locking the odometer (and this is why it was shifting out of position). I am tempted to try some locktite on the smallest of the gears (it's at just over 200k, so I've got almost 100k before I have to worry about THAT end slipping off), but am worried about gumming up the rest of the works. Fundamentally, it's only a problem with the first rollover (9-10, 19-20, 29-30 etc.), so I suppose if I locktite that one and let the rest spin on the shaft I should be OK - or is one of the other rollover gears supposed to be fixed w.r.t. the shaft?

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Lifetime owner
1977 240D

"new" owner
1988 300TE