Yes, the reality of automatic transmission cars is at 150,000-250,000 miles , you may need a transmission rebuild. The w124s were real bad. Me and friends did 3 transmissions in one summer. We pulled them and took them to a local transmission shop that did a lot of MB and audi and vw . The mb indie shop recommended a guy there to me. It cost's 900.00 a piece for rebuild. Even manual transmissions go. My 1998 beetle tdi just blew the tranny . I put new clutch and pressure plate in a couple years ago. Now tranny blew out.

My suggestion is pull the transmission yourself and take it to someone who knows those and can rebuild it, test the valve body etc. Should be maybe 1500 . Maybe try a valve body first. A lot of times transmission shops can get good used ones.

Once that's done you won't be sorry. It's cheaper than a new car. And if you know the rest of the car is good you just bought it another 150,000 miles or so hopefully.

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius