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      03-22-2011, 11:51 PM   #18
4th down; 4th quarter? Renegade.
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Drives: 09 SSII E92 M3; 12 AW X5d
Join Date: Aug 2008
Location: Pittsburgh, PA

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Originally Posted by alpina527 View Post
If this were true, wouldn't the service indicator reset itself when you put fresh oil in?
No, because that is not how BMW designed it to work. The system is designed to be reset any time you add new oil. It is not designed to detect new oil. Also, as I said, the interval is not based solely on this, fairly simple, sensor. The sensor is merely one measurement that it takes into account.

Likewise, if you had the car serviced with low quality 10w30 oil (in theory) would the service indicator call for an early oil change?
If the low quality oil resulted in higher levels of conductive material in the oil, then the sensor should communicate that to whatever governing algorithm is monitoring it resulting in a reduction in the miles to the next oil change. Of course, I have yet to see any document that defines the specifics of the monitoring or the algorithm, so exactly how it will work is speculation.