Originally Posted by j8smith
Looking at the diagrams for the E90 and E87(www.realoem.com/bmw
) it looks like the different reservoir indicates Active steering, not electric steering. The standard hydraulic has a star shaped cap on the reservoir, While the active steering has a flat round cap.
Also, servotronic only refers to variable assist, not to weather the steering is electric/hydraulic/mechanical
if you read that link it I put there it basically says BMW has 3 types of steering, servotronic witch is a electric servo driven hydraulic power steering witch is the standard engine driven hydraulic and active steering. the servo hydraulic is the one with the bad reviews. at least that is what I got out of a little research but i could be wrong wouldn't be the first time :iono: