People don't experience problems when they know they are buying a used car and do necessary maintenance after buying.
If you keep on using the car without changing plugs, gear oil. You put non synthetic oil in it. You are bound to get problems.
Sorry to say but Volverine brother has had one merc only.
There are plenty other users as well. I bought a w203 two weeks back and the seller bought the new shape c class the very next day.
The main emphasis of jaggi and me was to tell you that the maintenance is expensive if you need to do it.
Nicely maintained cars do not give problems. Badly maintained do.
BUT if you are too cautious, I suggest don't buy a benz,
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