You can also get it at the dealer. I have a bottle and will upload a photo (with Part number) when I get home. From my understanding, Febi makes the oil and bottles it for MB. I could be wrong, but I believe I seen it posted somewhere.It's a mineral-based hydraulic oil. Febi sells one version, and I think there's others. There are folks here who've used tractor hydraulic oil (John Deere) without issue. I get mine from AutohausAZ or BMA.
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and please start using the search function.....
30 min As 420SE suggested, I plugged "sls fluid" in the Google search box - the top result was: http://www.benzworld.org/forums/w126-s-se-sec-sel-sd/1222812-sls-fluid.html (from 2005). Try including W126, or your car's model (560, etc.) to narrow things further.30 minutes of searching unrelevant posts and pages of comments only to require the answer to a simple question is getting crazy.
Here is a photo of the front and back of the oil bottle I have. The back has the MB part number under the bar code. Also look for FEBI ZH-M fluid should also do the trick. The bottle looks different but it's the same stuff.You can also get it at the dealer. I have a bottle and will upload a photo (with Part number) when I get home. From my understanding, Febi makes the oil and bottles it for MB. I could be wrong, but I believe I seen it posted somewhere.
Its somewhere in the forum archive. Check the 'Welcome...' announcement on top of the forum re search.After searching various M/B forums, it seems to be a mineral oil based hydraulic oil. It is my understanding a petroleum based oil will attack the rubber membrane in the accumulators causing them to fail.
I've read that Jonathon of blueridgemb uses John Deere Hydraulic oil.
Not sure if here or another Benz forum.