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Distance remaining vs. mileage at service
AFAIK the spark plugs get replaced at 100,000 miles, regardless of driving style. If the mileage display shows the miles remaining, mine should have counted down to 96,000, as my E90 has 4,000 miles on it.
I don't really know why they included the spark plugs in the readouts (really long mileage item at 100k) and not the O2 sensors (every 120k, not that much longer than the plugs).
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