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Well first of all, BMW doesn't say '15,000' miles. The mileage is calculated taking into consideration your driving habits, so mileage will vary. Secondly, you are entitled 1 free oil change every year regardless of your mileage. So in my case, since I only do maybe 10k a year I will be sticking to the single oil change interval per year. BTW changing it every 3k is just wastful no matter how much money you have, not to mention the environmental impact.
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