Photograph of line of different brands of oils, Southern California, 1933. "Gilmore, Motor Oil, Eastoil, 100% Paraffine Base, Heavy; Central Petroleum Corporation of California; Socony, Dewaxed Paraffine Base Motor Oil; 35¢ a quart; Union Red Line; Union Products; Copyright 1934 by Union Oil Company of California, Motor Oil; Cycol Motor Oil Spl. Heavy S.A.E. 40; Texaco Reg TM; 100% Pure Pennsylvania Motor Oil, Pennzoil Safe Lubrication Heavy S.A.E. 50; Motor Oil, Guaranteed By the Pennzoil Company, 100% Pure Pennsylvania Oil of Supreme Quality, Pennzoil 30¢ a quart; Gilmore Monarch [ilg] Lion Head, Purest Pennsylvania, Motor Oil The Most Highly Filtered Motor Oil in America, Heavy SAE 50; Richlube, 100% Pure Pennsylvania Motor Oil, Oil Company of California, SAE No 50, GB Narro-Lube; 100% Pure Pennsylvania Motor Oil, Pennzoil, Safe Lubrication Medium-SAE 30, Motor Oil, 30¢ a quart; Rio Grande 100% Paraffin Base Motor Oils, D SAE 40; Union Red Line, Union Products, Copyright [ilg] Union Oil Company of California, Motor Oil" -- on gas tanks. "Stop" -- on street sign. "First Grade Gasoline Only" -- on sign.