Quote:
Originally Posted by goldminer
Just guessing here but the BMW has a computer that calculates the required time for service. It measure such things as average length of trip, whether the engine came fully up to temp, average speeds etc. (Long trips at highway speed are best for oil life.) These are used to determine how severe your service duty cycle is. 1,200 miles is just an average. So you must be driving a normal rather than severe duty cycle.
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I believe the service intervals are based on a function of the fuel consumption and nothing else.
Lots of short journeys = high average fuel consumption = shorter service interval.
Long journeys = low average fuel consumption = longer service interval.
I don't think it's as complicated as measuring the temperature of the oil etc.