One contender is that it refers to the Canadian inventor Elijah McCoy, born in or around 1844, who invented many things including an automatic lubricator for steam engines. (bookbrowse.com)
Other automatic lubricators followed but were considered inferior thus engineers were said to ask for «the real McCoy». (bookbrowse.com)
Moduflex Lite combines lightweight and corrosion - resistant construction with patented nano - lubrication technology that allows oil mist up to 40m along the air line as opposed to a maximum of only 15m with more traditional lubricators. (innovationsfood.com)