hydraulic fluid leak
 

I have just purchased a 1990 500sl. I removed the hard top and put the soft top up and then back down and started getting fluid from the drivers side window post. I seen it seems to be a common problem area. Where is the hydraulic reservoir so I can make sure it doesn't go empty and what fluid should I use to fill? By the way I'm excited to be a Benz owner and zoom around in my drop top. :D