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A technique has been developed which permits the determination of engine oil consumption on an instantaneous basis. The procedure uses the sulfur in the oil as a tracer. The concentration of sulfur compounds in the exhaust gas is determined using a Flame Photometric Detector (FPD). Special modifications of the FPD reduce the interference of other gases and improve the accuracy of the instrument. Although the unit is operationally simple, its abilities to measure continuously and respond quickly allow it to surpass conventional methods for measurement of oil consumption.