Sounds like it is running run flat tires. Maybe try a sheepskin on drivers seat? I don't know how to keep it from wadding up.

I'm still trying to find how to set/check transmission fluid level in the MB fwd vehicles. They have a very interesting transmission filter arrangement - there are three filters on it and they are all external of any pan (if it is the same as the 2020 GLB250 I recently had in the shop).

They are good driving vehicles. I was pleasantly surprised by the proper feeling dynamics of the FWD. Looks to me like MB studied the fwd Honda line up.

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Jim