Ronald MacDonald gives underside of car a spray treatment with used motor oil

Original Toronto Star caption: Ronald MacDonald gives underside of car a spray treatment with used motor oil. He and partner Frank Latchford say that twice annual applications will extend the rust-free life of a car by two to three years. MacDonald says that the tar-like substance used by other undercoaters dries; chips and eventually collects salt in crevices. Name of their firm is Preserve-A-Car-With-Oil.