Fill the reservoir with hydraulic jack oil.
Substitute for floor jack oil.
The jack oil i have used is lighter than dte 24 so sae 10 looks like it would be sluggish.
How to make a simple and cheap replacement for a hydraulic jack oil cap.
I get dte 24 in 5 gallon buckets for hydraulic systems.
2 59 qt i use it in compressors floor jacks air tools lawnmowers chainsaw oilers my bandsaw cylinder.
I can get it from the auto parts store in sae 20 30 40 wt.
I believe 46w hyd oil is sae 20wt.
Do not use any other type of oil besides hydraulic jack oil.
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How to change the oil in either your floor jack or bottle jack.
Bill 03 06 2017 12 30 am 11.
I use plain old non detergent motor oil for stuff like this.
Pour until the oil is just below the lower rim of the fill hole then stop.
What you may be better off to do is to take the bottle jack out a floor jack is usually just a bottle jack laying sideways in a frame and replacing it with a similar one.
Use a funnel to avoid spills.
Wipe away any excess oil on the rim before replacing the plug.
Motor oil or brake fluid will not work.