I have been using an earlier model of this for over 2 years, to fill my Big bores and higher fill pressure guns in the field or back yard, even topped off my 90 ci bottle once when I was rebuilding mt Shoe Box that ran 5 years before it needed a rebuild. This is one of the few that have a port to introduce a couple drops of silicone oil into the system periodically, and I do believe it makes a difference.http://www.new-warrior-compressors.com/por/9.html