I topped-up the oil on my hydraulic trolley jack some years ago.
I bought this:
www.halfords.com/workshop-tools/garage-workshop/tr...l
I'm sure there are many other similar products around which would do the same job.
As far as I'm aware you only need to top the oil up on a jack. However, should you wish to change it, assuming you can get the existing oil out, I can't see that would be a problem.
Personally I wouldn't bother - I'd just top it up!
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