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Just to dispel any sense of urgency here ... although the manual prefers the 1/2" recommendation, any measurement down to about 1 1/2" will still allow the system to operate safely. Basically when all slides are extended, you want the pump intake pickup covered in oil to eliminate pumping of air into the system. One thing you definitely want to do is have all the slides in before "topping off" the reservoir no matter what you're calling full...
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