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The car knows...
A friend bought a new BMW and asked about when the oil should be changed. He was told that there was no recommended time or mileage, but that instead the car would let him know when it was time. Sure enough, at about 12000 miles, the "Change Oil" indicator lit up. His guess was that there's some turbidity or acidity sensor keeping watch on the oil. A nice touch, that, although I bet the oil companies prefer the 3000 mile recommendation!
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