Fill the reservoir with hydraulic jack oil.
Substitute for floor jack oil.
Wipe away any excess oil on the rim before replacing the plug.
Jack oil substitution 03 04 2010 3 32 pm do not use brake fluid it is not really an oil it is more closely related to anti freeze than oil it will destroy the seals.
I can get it from the auto parts store in sae 20 30 40 wt.
The jack oil i have used is lighter than dte 24 so sae 10 looks like it would be sluggish.
How to change the oil in either your floor jack or bottle jack.
Use a funnel to avoid spills.
2 59 qt i use it in compressors floor jacks air tools lawnmowers chainsaw oilers my bandsaw cylinder.
I believe 46w hyd oil is sae 20wt.
How to make a simple and cheap replacement for a hydraulic jack oil cap.
May need to drill some holes though.
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.
Do not use any other type of oil besides hydraulic jack oil.
Motor oil or brake fluid will not work.
Pour until the oil is just below the lower rim of the fill hole then stop.
How to change the oil in either your floor jack or bottle jack.
I use plain old non detergent motor oil for stuff like this.