PCMO will have better rust and water tolerance as well as sludge dispersion but lower EP or AW properties but in a low use/load environment both would be fine IMHO
1 - Is this formulation unstable and will it oxidize / breakdown into acetic acid, other acids/salts etc? If breakdown is likely, is this a valid concern or it is on a small scale that it should not be a major issue?
Sulfonates are a common rust inhibitor for steel and yes is old school they...
the level will go up and down depending on where the jack is as per height, When down all the oil that is NOT in the cylinder has to go some where that is maybe why the level look low?
Use what ever clean new mineral based oil you have NOT brake fluid, you have laying around its a jack not a...
"Their branded fluid is $20~25/qt and it takes 4.71 quarts. I've not been able to find out anything about this fluids properties other than it contains mineral oil and zinc alkyldithoiophosphate. But for a 1,000 service interval, I guess that's better than most."
LOL for $25 per quart i would...