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What I don't understand is how the hell can BMW claim that the N52/N54 engine can be driven for 15k miles without an oil change. In all the previous BMWs that my friends and family owned the oil change interval was about 5k miles. So what kind of magic did BMW put into the new engines? In the end it all comes down to simple economics. BMW is paying for your oil change so they want to stretch out the intervals as much as possible.
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