1929 Mobiloil Your Tractor isn't a Laboratory Ad #2341

This original 7 x 13" ad comes untrimmed from its  master 10 x 13"  page as published in a 1929 edition of an American Agriculturist, to promote the Mobiloil - Gargoyle Logo - usage in your Farm Equipment. The ad claims that you would save 15 - 50% in oil consumption by using their oil.  The image has been cropped to just focus on the ad portion of the page.