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For years many shops and A&P's have used strut pumps to inflate air/oil,
"oleo", struts with not too many problems.  It is true the oxy in air will
accelerate the deterioration of the MIL-H-5606 hyd fluid.  Moisture also can
enter.  Nitrogen is the best way to go but not always available.  Use it
when you can as it is the best.  It works well in tires, too, just don't let
it get away and blow up your expensive rubber or your face.  Many aircraft
will not allow plain air to be used for either.
Walter Dodson

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.