Quote:
Originally Posted by Vreimann
Service manager I talked with says it starts with a preset number and subtracts miles driven multiplied by a factor. The factor I was told is a bunch of things that affect the oil life. Things like did the car get up to temperature, how long was the trip, average speed. So city driving miles will drop the distance to a change faster than highway miles. Not a sensor though that measures conductivity or other properties of the oil.
I wish it did measure something so the prediction of changes is more accurate.
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OLM's calculating intervals like this are state of the art in our cars and do an excellent job of managing that task. If you want more detail take a sample and send it in for analysis.