The seals are leaking in the pistons inside of the trans. If you are not a DIY, I do recommend the dealer for this. Their transmissions are high quality and priced well.

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Benzmac:
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM