Quote:
Originally Posted by John Doe
I would think you would possibly cause more problems than you could solve changing oil in a floor jack. There would be no thermal breakdown, and no foreign particles in the oil, unless one had been checking the oil level periodically and opening the cylinder  If the viscociy in the oil is the same as when you started and is clean, why mess with it and risk a leak or introduction of dirt into the cylider? |
jack oil does get dirty even when kept sealed. and the level will drop over time eventully. when my jack stops working properly i open it up and add a little
BRAKEfluid. my grandpa did that all of his life.