hi there all. just new here so i hope to get it right to be where this should be. i have a '93 540i shadowline,pics soon. does anybody know about what ive been told is a hydro unit. located in the left rear top of engine bay. Its got a slow leak and im told its a sealed unit and about $3500 au to repalce from bmw. Can a tape product be put around it for now? it leaks power sterring fluid so i know its not brakes but parts sites semm to call this a hydro unit.