Parameter steering issue
 

Hi guys,

My e430 has the parameter steering option and it works only when the car is cold. When the engine is cold the steering turns like butter in parking lot speeds. After driving about 30minutes or so when I steer in slow speed it has a resistance. It feels like my old Japanese cars.
The fluid was overfilled when I bought it. It was up until the cap. Then I sucked some of it out and now the level is normal.
Any help would be appreciated.

Thanks