First, your car weights a little more the 3,000 pounds, try 3,850. Second, is there any fluid at all in the hyd. res.? I would get under the backend of the car and eyeball where the hole is and see if you can temp. repair it. For the fluid, go to the top of this screen and click on Fastlane and order the fluid. It is made by Febi/Bilstein. Also if you haven't already, buy yourself a Haynes manual on the "MB diesel 123 series", this will help you with various things on the car. They don't go into too much detail for the leveling system, but it does tell you how to test it and how much fluid you will need.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section