Vintage Castrol Motor Oil Porcelain Sign. Displaying an iconic green and red color scheme, this vintage porcelain sign is a must-have for Wakefield Motor Oil enthusiasts and collectors alike. Measuring at 11″ x 7 3/4″, this sign is the perfect addition to any gas & oil or automotive-themed collection. Add this impressive piece to your collection today. This sign will enhance your mancave, collection, bar, shop, or garage. It is your chance to own a piece of Castrol advertising. Vintage Harley Davidson Motorcycles porcelain sign. Motor Oil Quart Can. 11″ x 7 3/4″. Vibrant colors and excellent porcelain.