Its a mineral oil based hydraulic oil. Don't use petroleum based oils or risk seal failures. But only a bonehead would do this (glad there are no mirrors around!)

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1983 300td 240k (down with bad tranny)
1984 300d 222k (daily driver) "Olive"
1997 GMC K2500 105k (sled dog limo)

"The scenery in ANWR is as spectacular as the Grand Canyon and the wildlife is more impressive."