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Show HOW TO TEST OUT LUBRICATING OILS Tiir color of an oil is an unsafe pofije to ita lubricating value. Cheap, interior oils may be treated to give t ho appearance or high-grade lubricants. Neither are the much talked of chemical chem-ical tests of real value to the. consumer, often they are used by the "oil job-lii'r's job-lii'r's " .salesman to mystify and impress lhe purchaser with his superior knowledge; knowl-edge; whereas, if the truth were, known, usually the salesman would be found ignorant of tho real 'meaning of the lesls. 'Phis would not be clear to any but an experienced oil chemist or re-liner. re-liner. Valvoline oils are of the highest high-est test. However, they are not selling test;: but are selling "lubricating service," serv-ice," and the fifty years' success in ai-tual service is the 'best test of all, (he test of time, and the real proof Of the superiority of Valvoline oils. The pioneers m the business of refining mineral min-eral lubricating oils, and the largest independent refiners of lubricating oil in' the world. |