Please make sure it has never gone more than 10,000-miles between oil changes. Less is better. More is death on these motors. Back when BMW had a 15,000-mile oil-change interval on the 4-cyl turbo motor, their life expectancy was around 80k. The later versions with the 10k interval fared much better. Did you see the Carfax? Did you see the BMW service history report? BMW dealers can't even certify cars that have missed their required oil-service interval—for good reason!
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