The number is calculated based on your driving habits. If you spend more time at higher revs or in city traffic, the countdown will dwindle more quickly. I actually prefer to have oil services at shorter intervals than the service indicator calls for. I just don't want to use the same oil for 15000 miles.
If you are still under warrranty, why not have it done by a BMW dealership for free? Otherwise, you can either do it yourself, or find a good, reputable shop in your area
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