have you looked under the floor?
I would expect it to use the same hydraulic oil as the lifting mechanism.
as long as it lifts fully you don't need to add oil, and only check it with the forks lowered all the way and tilted forward.
what makes you think it is low on oil?
is the steering hard? does the steering motor run? do you hear a contactor click when you turn on the key and have the seat switch closed?
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