Don't know if you realize that original 1992 S-class car owners filed & won Class-action law suit on problems with this car. MB also had to pay for all maint & repair items on these cars for 4/50. The 1992 models are to be avoided as many problems were design problems. Many of which you are finding out about. Seeems that this car was rushed to market.

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 ITS RACECAR
1986 190E 16V