As it seems that there are some REAL knowledgeable folk on here that know about Hydraulic oils, I'll risk tagging on to Brian's thread and ask a question for my own use.
After my father died back in July, I brought a lot of useful tools of his back to Bulgaria, amongst them was a big heavy Trolley Jack. Unfortunately, in transit it leaked/lost most of the hydraulic oil and I have been meaning to attend to it, drain the rest out and replace the OIL, BUT with what type?
I doubt that I'll be lifting anything heavier than a vehicle with it, but even still, I don't want the jack to collapse on me or anyone else so any advice is appreciated. By the way, I don't think any of the seals are damaged it was just a filler tap (I believe) that was loose causing the loss of oil in transit.