Check all the suspension parts as well. The second thing I do after replacing all the oils, fluids and filters is I go over the steering and suspension parts and replace what's needed with quality parts. Even with a low mileage W126, suspension parts wear out and getting it back to factory spec is key in enjoining these rides.

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).