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Well, my hydraulic inexperience shows through. My friend who ran heavy equipment for long, long time, and has the kboom, said that if its not contaminated, just change the filter. Different than a transmission, I guess. Engine oil gets dirty from combustion soot.

I'm learning more about hydraulics and diesel engines. The R and O is anti-Rust and anti-Oxidation. HOLY SH^%. Two bald eagles just flew by outside my window, about 20' from the house. I'm only about 300' from a creek that empties into the Puget Sound about 0.5 miles from here. Back to the...

The Boxer says ISO 46. The label says R and O hydraulic oil. The first container that I emptied, which has been in the shop, said ISO 46. http://www.walmart.com/ip/Super-Tech-R-and-O-Hydraulic-Oil-5-Gallon/16795135

Unfortunately, no ISO rating on the bottle. Internet Reviews had the same problem by other consumers.

I had clear hydraulic oil for my Boxer. I was refilling with two jugs I had on hand, which were clear. When I started to pour http://www.walmart.com/ip/Super-Tech-R-and-O-Hydraulic-Oil-5-Gallon/16795135 this, it was red. I can't find ISO 46 on the jug. I'm going to go look some more. It...