Premium Member 2001 SLK320/2000 SLK230
One of the things being reported by the iCarSoft scanner is a value for "Oil Quality". Does anyone know what the range and values mean ? e.g. a value of 2.29 ?
Oil quality is determined by the electrical capacitance of the engine oil (engine oil can store an electrical charge). The charge level increases as the oil quality deteriorates. By measuring that capacity, the engine control unit (ECU) can determine the quality of the oil
I'm getting closer to your question but no cigar yet.In addition, Daimler discovered that oil degradation is correlated directly with its ability to conduct electric current. Therefore, Daimler has fitted V-6 and V-8 engines with a digital oil quality dielectric sensor, that is mounted above the oil pan along with an analog oil level sensor. This sensor measures changes in capacitance, which effectively is a proxy for the amount and type of contaminants and oil degradation products present in the oil. An increase in dielectric constant (less resistance to electrical flow) indicates oil contamination and degradation.
Daimler-Benz (Mercedes-Benz) has been incorporating the sensor into its vehicles since 1998.
Depending on what the sensor reads, the idiot light comes up on the dash.These are the signal assignments from the oil sensor:
On/off ratio signals OK
A: Oil temperature 20 to 80%
B: Oil level 20 to 80%
C: Oil quality 20 to 80%
On/off ratio signals is greater than 80%
A: Oil temperature is greater than +160°C
B: Oil level is greater than 80 mm
C: Oil quality good
On/off ratio signals is less than 20%
A: Oil temperature is less than -40°C
B: Oil level is less than 0 mm
C: Oil quality poor