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Additives are essential ingredients of today’s motor gasolines. They enhance fuel quality by supplementing its natural characteristics or by providing new properties. As a result of additive use and modern refining methods, today’s inexpensive motor gasolines give excellent service performance and long storage life. This has permitted engine and equipment manufacturers to build more powerful and efficient equipment which operates with a minimum of service difficulties. In spite of the broad well-established use of additives by the petroleum industry, the average mechanical engineer engaged in engine or equipment development has little opportunity to become more than casually acquainted with them. Thus, he is unlikely to have more than a hazy idea of their functions. Nor is he likely to fully appreciate the extensive and thorough chemical and engineering development that usually precedes their marketing.