It being your first Mercedes, you might be experiencing what we all love about the car.

If the car is not lowered, it is unlikely that the Bil sports (yellow tube body) are installed, since they were designed to handle the shorter stroke length that lowering springs work with. Bilstein made Comfort (slightly better than OEM Sach/Boge) and HD (valved for firmer than OEM, usually used if you've got the Sportline suspension option, or have typically heavy payloads).