Gentlemen,

Could you tell me what this leak (top left) might be from so I can research it a little better?



I thought my differential was leaking and so I jacked up the car to replace the fluid and noticed it wasn't the diff.

Thanks.

Self leveling suspension control valve.

Those valves are rebuildable, and there is a kit available for it.

If you are not inclined to DIY it, there is (or at least was) a forum member who used to rebuild and sell them, I purchased one about four years ago for my wagon. Cannot recall his handle.

Put an ad in the used parts for sale subforum looking for a rebuilder, if no one follows up here with a name.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22

DIY: Rebuild the self leveling suspension SLS valve on w123 300TD wagon sagging rear

w123 Self-Leveling-System O-ring replacement DIY

Biodiesel300TD sells (or sold) the o-ring kits (see second link above). the units are EASY to rebuild. the hardest part is removing/installing the unit from the vehicle without damaging the lines or fittings

Thanks guys.

At work right now but will read through the links supplied later tonight, thank you much.

If its the SLS, is it hydraulic fluid that is leaking then?

Thanks,
John

Its a type of hydraulic fluid. If you are looking to refil the bottle I would recommend buying the MB stuff. Febi might have an alternative. Don't just throw any hydraulic fluid in there.

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
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90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

Self Leveling Suspension = SLS hydro pneumatic


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For fluid mineral oil will work as well. I often suggest people use that since it's cheaper and easier to find, until they can rebuild the valve. Then once the valve have been resealed put in the MB or Febi oil.

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