Original oil and gas trade magazine vintage ad for MOTOR OILS OF THE FUTURE. Addition Agents will be Common, said C.M. Larson, supervising engineer of Sinclair Refining Company, in a paper presented at Tractor meeting, Chicago section, Society of Automotive Engineers at Peoria, IL. This unique 1937 three-page magazine article would display beautifully matted and framed. A fabulous look into the future of motor oils, from 80 years ago.