Just saw my sDrive today and it appears to have EPS despite ordering Servotronic. I didn't drive it yet but I'll have to see how it compares to the sDrive EPS w/o Servotronic. The EPS w/o Servo was already light at low speed; hopefully Servo makes it heavier at low speeds. The best steering combination may be HPS w/o servo.
It's the cap on the left that's up highest, must be the one that says CHF 11 the other one might be your expansion tank. Mine doesn't have that one and my expansion tank seems to be on the right.