My 20 year old Walker/Lincoln floor jack was leaking down. After not being able to find somebody to rebuild it for a price less than a new jack, I went a different route. I changed the
oil in it with some jack
oil that I found at Advance Auto Parts. This new
oil had some sort of stop leak/seal conditioner in it. It did not solve my problem at first, but after 4 days, my jack worked good as new & has been for the last year. Cost was about 5 bucks.