I added up all the capacities, (of everything) then bought enough fluid to cover it all. I still only used about half of it. Maybe I did the math wrong while looking at the manual.
By the way, we have a 12,000 lb. capacity Bend Pak here at the shop, so there ain't no crawlin' underneath. http://www.bendpak.com/car-lifts/two-post-lifts/