Hi
It is all 10W petroleum oil mil speck 5606 with different additives in it. You will not damage the system using any 10W petroleum oil from sewing machine oil to hydraulic jack oil.
I don’t recommend any synthetic oils for these systems and not mixing the synthetic oil with petroleum oil.
As for the brown oil I have no reference to that color in my technical information hydraulic oil even the stuff Cat and JD use is clear.
Using what is priestly in the system is also recommended if you purchased the unit new I would use the Lippert recommended fluid but because of the lack of a quality control on the production line there is now telling what was installed at the factory.
Do not use automotive brake fluid under any circumstance.
Phil P
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2009 Montana 3665RE
2009 Duramax 3500 DRW quad cab
personal web page https:// www.sallyscoffees.com
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