2pt - do a search on it and you should find all kinds of information on here.
ako - to change the fluid disconnect the return line that comes in near the top of the hyd reservoir. Slip a plastic hose over the end of this return line and run it down into a container sitting on the ground. Start the car and keep replinishing the fluid as it is sucked out of the reservoir. When it is pretty clear from the return line it will be changed. Also, if it is like the W123 it will have a screen in the top of the reservoir that will either need to be cleaned or replaced. Not quite certain but I believe you are supposed to raise/lower the rear of the car while changing to get it to "change" at the struts.