Originally Posted by ngarover

If the stuff is all basically off and you want to do it right, here are some good steps to follow.

1. Replace the rubber bits in the rear. I'm talking the Sub-frame mounts. These can run you 300 bucks but I can almost promise you they need to be replaced.
part # for TD is 123 350 03 75 and part # for a sedan is 123 350 01 75 The wagons version is slightly different and made out of a harder rubber than the sedans.
https://www.pelicanparts.com/More_Info/1233500375.htm?pn=123-350-03-75-MBZ&fbclid=IwAR3BFzQEjHI8IZVnGOBF8Miss-5yV8EUZygXIgPeRF0FyAl1T9p1ZZ_zBqg

The worn out mounts cause the car to sag. The car should sit at the correct height on it's own with just the springs. IF that's not the case, then you have work to do.

2. Might as well rebuilt both the sls leveler at the rear of the car, and the pump at the front. I've done the leveler myself, not the pump yet as mines still working fine with no leaking. You know when they leak cause the fluid will turn black from oil contamination from the engine. There are kit's available from the Merc Source guy. Peach may be able to put something together if you asked them.

3. Replace the spheres. They are cheap, might as well just get it done.

4. IF the struts you have are not leaking, don't worry about them till they are. you can have them resealed at a local hydraulic shop for about 180. That's what I paid here in Chattanooga to have mine done.

5. rebuild that high pressure hose coming off the pump in the front. it's not hard, I did mine in the garage with basic tools, and the ends are totally reusable. there are instructions here on peach.

In my opinion, a working SLS system is a dream. Setup correctly your car will ride fantastic.