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To echo what others have already said, if you can't definitively prove that the balance shafts have been redone (BY A MERCEDES DEALER), simply WALK AWAY. Another one will come up that fits the bill and has had the repair done.
The balance shaft is there for make the engine SMOOTH. If it's rough, there's a problem. Could be one of many things, including fuel, ignition, or other mechanical issues. If you're dead-set on the car, take it to a reputable indy and have them check it over for faults (if it's running rough it certainly has some sort of fault).
I wouldn't waste too much money on Carfax, or if you do, take their report with a gain of salt. It certainly won't show if any recalls or dealer service have been performed. One of my friends totaled their car and elected to have it repaired (salvage/rebuilt title). When they went to trade it in a couple years later, they ran a CarFax and it showed it had a clear title with no accident history. Not exactly accurate...
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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)
Black Sheep:
1985 524TD 167K (TotalDumpster™)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
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