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      06-05-2012, 02:48 PM   #2
goldminer
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Canada
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Drives: 2011 SG E92 M3, 6MT
Join Date: Feb 2006
Location: Toronto, Ontario, Canada

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I don't belive there is such a sensor. I think that the oil change is a calculated estimate based on the mileage driven and the type of driving (i.e. average length of trip, did the engine come fully up to temperature most times, outside termperatures, average speed or whatever).