RV Slideout Pump Oil

What kind of hydraulic oil do you use in the slide-out pump?
Joe, (Fostoria, OH)

Hey Joe, I do like those quick, to-the-point questions! Always use Automatic Transmission Fluid (ATF) in your slide-out pump. Most slideout and leveling jack pumps use ATF. Any other fluid, including hydraulic jack fluid, is not recommended by those manufacturers I've contacted. Anything other than ATF could even damage the seals.