I've had Sachs on my W124 and was happy with them. They were less expensive than the Bilsteins at the time I purchased. Mercedes OEM is usually Bilstein. Sometimes MB contracts Sachs. Most on this board favour Bilstein. I've only ever considered Bilstein or Sachs.

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ARVY

1999 E430
1999 C230 Kompressor
1992 300E (write-off)
1984 190D 2.2 (sold)