Well, some people would already have fixed this problem as they may not want to walk anywhere BUT since the car always moves then it is up to you when you want to spend the $$$.
Since you are driving a 26 year old car spending big $$$ doesn't always make sense.
MY first car was a Healy 100-6 so I have learned that walking is GOOD thing.
There are some magical trans additives aroung here that soften the trans seals so this this type of bleed off "doesn't" happen.
A complete overhaul would be in order!
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)