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olm's
Direct measurement oil life indicators measure the condition of the oil -- the opposite approach to the system described above. This method uses sensors to sample the oil and determine its remaining life based on any of the following:
Direct measurement oil life indicators measure the condition of the oil -- the opposite approach to the system described above. This method uses sensors to sample the oil and determine its remaining life based on any of the following:
- Conductivity -- how easily electric current passes through the oil (typically, the lower the electrical resistance, the more contaminants are in the oil)
- Mechanical properties -- piezoelectric sensors can tell how thick the oil is by the force feedback it gives when sloshing around
- Soot concentration -- dirty oil's days are definitely numbered
- Presence of water -- water is an impurity in oil, since it hampers the oil's effectiveness and can corrode metal surfaces