Points of Attention

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Dear Merc Owners,

I am a new member of our forum, So hi over there.
I had no car so far. But in the close future I think to own a W124. In order not to have any problems after purchase, I would like to be aware of most necessary points. Dear members, Please advise me on this issue. What are the most important points I have to consider during tradong???

Thx beforehand...