I think that Mercedes cars through the early '90s were engineered and built to last, to be used for a very long time but still cars. The pressure to have extended service intervals and "permanently lubricated" systems doesn't fare as well for them in their old age, plus many of the items that typically wear out, such as sunroofs, do have a service interval that is usually ignored once out of the original owners' hands.

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Gone to the dark side

- Jeff