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I've spoken to a family friend who used to be a BMW Master Mechanic and he said that synthetic oil is fine for 12,000-15,000 miles, but oil filters cannot last that long. He recommended changing the oil filter at least every 10,000 miles. Since BMW pays for services every 15,000 miles, he recommended changing the oil and filter every 7,500 miles. Obviously, changing the oil after the break-in is also up to you.
The schedule would look like this:
7,500 miles, you pay
15,000 miles, BMW pays
22,500 miles, you pay
30,000 miles, BMW pays
37,500 miles, you pay
45,000 miles, BMW pays
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