Regular oil consumption measurements can increase the maintenance intervals and reduce maintenance costs. The special feature of LEC OilTracer is the continuous measurement. There is no other system that delivers time-resolved oil consumption values and is compatible with any fuel and combustion concept. LEC OilTracer solves the task of accurate measurement using a specially developed tracer. The tracer is detected in the water vapor of the exhaust gas by means of a laser spectrometer from which the online oil consumption is calculated. The system is easy to use, and the customer's specification of the desired measurement accuracy is met by means of a customized tracer.