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Old 10-12-2003, 11:19 AM
Duke2.6 Duke2.6 is offline
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Join Date: Mar 2003
Location: Southern California
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There are a couple of different types of oil quality monitoring systems. The simplest type has algorithms built into the engine control system that uses mileage, the number of cold starts, average revs, and maybe average oil temperature to compute remaining oil life.

The most sophisticated type, which I believe includes the Mercedes FSS have a sensor that measures oil quality by monitoring the oil's dielectic strength. As the oil ages and becomes contaminated it becomes more conductive, so dielectric strength is a good measure of oil quality.

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