We have an old ('59 I think) Hyster H60 forklift at work. Hydraulic fluid leaks like a sieve when under load, and looks like used motor oil. We're going to change it, but what do these things take? Will a normal (AW46) hydraulic fluid be ok? Not sure if it doubles as tranny fluid, in which case I guess a multi purpose tractor fluid would be the best bet. Tough to find information on these old machines. Thanks guys.