Electronic version is no doubt more serviceable. Spare units are more plentiful. Mine is the vac version and it works great to this day. Last time i was browsing for new parts i saw a replacement vac actuator for mega bucks and im sure thers fewer good used units out there.

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"