low rise lift questions

I actually drained the fluid, when I got it out it was infected with water. Flushed the system using power steering fluid as it's a non foaming hydraulic fluid. Transmission fluid is a hydraulic fluid but not always anti foam. It had a couple burps and surges for the first couple cycles. But we picked up the Big block duster with ease, had it up for a couple weeks. Hit the lift valve on it once, and it picked it up off the locks and lowered down nice and steady. So far so good. I did replace a couple of tank fittings that looked a little iffy as well. The guy said it was always kept indoors, but I'm thinking he was a little shady. Thanks for the advice, when I change the fluid I'll look into atf.