Vintage Hudson Motor Oil Porcelain Sign. This vintage porcelain sign featuring the Hudson Motor Oil advertising sign. The sign boasts a beautiful graphic of the motorcycle in the center, with excellent porcelain and black & yellow color. The sign is in great condition and would make a wonderful addition to any collection or display. This will make the best piece of wall decor for your man-cave, collection, shop, or bar. Vintage Hudson Motor Oil porcelain sign. Vibrant colors and excellent porcelain.