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Originally Posted by steelerfan
You sure about that? It was explained to me by my local BMW service department the system will prompt me when it's ready... sometimes its beyond or shy of the 15K mileage we have in mind... Not sure how else it would vary unless it's somehow looking at the quality of the oil (if that is even possible)... If it was a hard set value of 15K, then it would prompt everytime at that mileage interval.
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It bases it on the length of trips taken, starts, stops, short trips etc.