loook at dis shit tooo coton cracker'!!!gots ya now bitch!!

Automatic Lubricator, "Real McCoy"
Elijah McCoy revolutionized industry in 1872 by inventing the first device to automatically oil machinery? No! The phrase "Real McCoy" arose to distinguish Elijah's inventions from cheap imitations? No!

The oil cup, which automatically delivers a steady trickle of lubricant to machine parts while the machine is running, predates McCoy's career; a description of one appears in the May 6, 1848 issue of Scientific American. The automatic "displacement lubricator" for steam engines was developed in 1860 by John Ramsbottom of England, and notably improved in 1862 by James Roscoe of the same country. The "hydrostatic" lubricator originated no later than 1871.

Variants of the phrase Real McCoy appear in Scottish literature dating back to at least 1856 — well before Elijah McCoy could have been involved.

Detailed evidence: The not-so-real McCoy
Also see The Fake McCoy and Did Somebody Say McTrash?