What system do you have? Most are self priming, it usually takes 4 or 5 cycles until all the air is gone. Why did you add hyd oil? Do you have a leaking hose or cylinder seal?
I have a full wall slide but the hoses are rubbish. I replace 2 or 3 every year!!
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2011 Georgetown 337DS
Toad: 2003 Dodge Dakota w Blue Ox
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