Someone recently on a thread had some good comments on how to repair the odometer gear by drilling and super glue.
Just a comment on how it breaks, I think mine broke by resetting the odometer when moving , now I only reset when stopped.
Yes watch the oil line it does make a big mess

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Ricali

03 C240 4matic wagon
95 300E 234,000
7 prior 240;s 5 still going
81 300sd gone
65 230sl gone
49 Studebaker Champion
90BMW convert.167,000
60 Dodge D-100